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40000020 = 2235666667
BaseRepresentation
bin1001100010010…
…1101000010100
32210021012201020
42120211220110
540220000040
63545201140
7663665064
oct230455024
983235636
1040000020
1120640675
12114901b0
138396868
1454533a4
1537a1cd0
hex2625a14

40000020 has 24 divisors (see below), whose sum is σ = 112000224. Its totient is φ = 10666656.

The previous prime is 40000003. The next prime is 40000021. The reversal of 40000020 is 2000004.

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 a junction number, because it is equal to n+sod(n) for n = 39999963 and 40000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40000021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333274 + ... + 333393.

It is an arithmetic number, because the mean of its divisors is an integer number (4666676).

Almost surely, 240000020 is an apocalyptic number.

It is an amenable number.

40000020 is an abundant number, since it is smaller than the sum of its proper divisors (72000204).

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

40000020 is a wasteful number, since it uses less digits than its factorization.

40000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666679 (or 666677 counting only the distinct ones).

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

The square root of 40000020 is about 6324.5569014754. The cubic root of 40000020 is about 341.9952463345.

Adding to 40000020 its reverse (2000004), we get a palindrome (42000024).

It can be divided in two parts, 400000 and 20, that multiplied together give a cube (8000000 = 2003).

The spelling of 40000020 in words is "forty million, twenty", and thus it is an aban number and an uban number.

Divisors: 1 2 3 4 5 6 10 12 15 20 30 60 666667 1333334 2000001 2666668 3333335 4000002 6666670 8000004 10000005 13333340 20000010 40000020