20500256164 has 12 divisors (see below), whose sum is σ = 35900183088. Its totient is φ = 10243061000.

The previous prime is 20500256143. The next prime is 20500256167. The reversal of 20500256164 is 46165200502.

It is not an unprimeable number, because it can be changed into a prime (20500256167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1760242 + ... + 1771849.

It is an arithmetic number, because the mean of its divisors is an integer number (2991681924).

Almost surely, 2^20500256164 is an apocalyptic number.

It is an amenable number.

20500256164 is a deficient number, since it is larger than the sum of its proper divisors (15399926924).

20500256164 is a wasteful number, since it uses less digits than its factorization.

20500256164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3533546 (or 3533544 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 20500256164 its reverse (46165200502), we get a palindrome (66665456666).

The spelling of 20500256164 in words is "twenty billion, five hundred million, two hundred fifty-six thousand, one hundred sixty-four".