20131103564 has 72 divisors (see below), whose sum is σ = 41746662720. Its totient is φ = 8420068800.

The previous prime is 20131103543. The next prime is 20131103581. The reversal of 20131103564 is 46530113102.

It is a super-2 number, since 2×20131103564² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2457227 + ... + 2465405.

It is an arithmetic number, because the mean of its divisors is an integer number (579814760).

Almost surely, 2^20131103564 is an apocalyptic number.

It is an amenable number.

20131103564 is an abundant number, since it is smaller than the sum of its proper divisors (21615559156).

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

20131103564 is a wasteful number, since it uses less digits than its factorization.

20131103564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8551 (or 8536 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

Adding to 20131103564 its reverse (46530113102), we get a palindrome (66661216666).

The spelling of 20131103564 in words is "twenty billion, one hundred thirty-one million, one hundred three thousand, five hundred sixty-four".