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400020 = 223559113
BaseRepresentation
bin1100001101010010100
3202022201120
41201222110
5100300040
612323540
73254145
oct1415224
9668646
10400020
112535a5
121735b0
131100ca
14a5acc
157d7d0
hex61a94

400020 has 48 divisors (see below), whose sum is σ = 1149120. Its totient is φ = 103936.

The previous prime is 400009. The next prime is 400031. The reversal of 400020 is 20004.

It is an interprime number because it is at equal distance from previous prime (400009) and next prime (400031).

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 399981 and 400008.

It is a congruent number.

It is an unprimeable number.

400020 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3484 + ... + 3596.

It is an arithmetic number, because the mean of its divisors is an integer number (23940).

2400020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (574560).

400020 is an abundant number, since it is smaller than the sum of its proper divisors (749100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400020 is a wasteful number, since it uses less digits than its factorization.

400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 6.

The square root of 400020 is about 632.4713432243. The cubic root of 400020 is about 73.6818579628.

Adding to 400020 its reverse (20004), we get a palindrome (420024).

The spelling of 400020 in words is "four hundred thousand, twenty", and thus it is an iban number.

Divisors: 1 2 3 4 5 6 10 12 15 20 30 59 60 113 118 177 226 236 295 339 354 452 565 590 678 708 885 1130 1180 1356 1695 1770 2260 3390 3540 6667 6780 13334 20001 26668 33335 40002 66670 80004 100005 133340 200010 400020