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20010000 = 243542329
BaseRepresentation
bin100110001010…
…1010000010000
31101122121120010
41030111100100
520110310000
61552514520
7332040123
oct114252020
941577503
1020010000
111032789a
12684ba40
1341b7b4a
14292c3ba
151b53d50
hex1315410

20010000 has 200 divisors, whose sum is σ = 69727680. Its totient is φ = 4928000.

The previous prime is 20009999. The next prime is 20010017. The reversal of 20010000 is 1002.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (3).

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 689986 + ... + 690014.

Almost surely, 220010000 is an apocalyptic number.

20010000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20010000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34863840).

20010000 is an abundant number, since it is smaller than the sum of its proper divisors (49717680).

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

20010000 is a wasteful number, since it uses less digits than its factorization.

20010000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 3.

The square root of 20010000 is about 4473.2538492690. The cubic root of 20010000 is about 271.4869944151.

Adding to 20010000 its reverse (1002), we get a palindrome (20011002).

The spelling of 20010000 in words is "twenty million, ten thousand".