20504500137 has 24 divisors (see below), whose sum is σ = 33506796960. Its totient is φ = 12426968160.

The previous prime is 20504500067. The next prime is 20504500147. The reversal of 20504500137 is 73100540502.

It is a happy number.

20504500137 is a `hidden beast` number, since 20 + 5 + 0 + 4 + 500 + 137 = 666.

It is not a de Polignac number, because 20504500137 - 2¹⁵ = 20504467369 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 20504500137.

It is not an unprimeable number, because it can be changed into a prime (20504500147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3832812 + ... + 3838157.

It is an arithmetic number, because the mean of its divisors is an integer number (1396116540).

Almost surely, 2^20504500137 is an apocalyptic number.

20504500137 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20504500137 is a deficient number, since it is larger than the sum of its proper divisors (13002296823).

20504500137 is an equidigital number, since it uses as much as digits as its factorization.

20504500137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670995 (or 7670983 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The spelling of 20504500137 in words is "twenty billion, five hundred four million, five hundred thousand, one hundred thirty-seven".