20013156864 has 80 divisors (see below), whose sum is σ = 59240375040. Its totient is φ = 6671047680.

The previous prime is 20013156851. The next prime is 20013156871. The reversal of 20013156864 is 46865131002.

It is a happy number.

20013156864 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 31 + 568 + 64 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 710032 + ... + 737679.

It is an arithmetic number, because the mean of its divisors is an integer number (740504688).

Almost surely, 2^20013156864 is an apocalyptic number.

20013156864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20013156864 is an abundant number, since it is smaller than the sum of its proper divisors (39227218176).

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

20013156864 is an equidigital number, since it uses as much as digits as its factorization.

20013156864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447738 (or 1447716 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 20013156864 its reverse (46865131002), we get a palindrome (66878287866).

The spelling of 20013156864 in words is "twenty billion, thirteen million, one hundred fifty-six thousand, eight hundred sixty-four".