20572164899 has 64 divisors (see below), whose sum is σ = 27397440000. Its totient is φ = 15129815040.

The previous prime is 20572164889. The next prime is 20572164911. The reversal of 20572164899 is 99846127502.

It is a Cunningham number, because it is equal to 143430²-1.

It is not a de Polignac number, because 20572164899 - 2⁴ = 20572164883 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20572164899.

It is not an unprimeable number, because it can be changed into a prime (20572164839) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2721377 + ... + 2728925.

It is an arithmetic number, because the mean of its divisors is an integer number (428085000).

Almost surely, 2^20572164899 is an apocalyptic number.

20572164899 is a deficient number, since it is larger than the sum of its proper divisors (6825275101).

20572164899 is a wasteful number, since it uses less digits than its factorization.

20572164899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7668.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 20572164899 in words is "twenty billion, five hundred seventy-two million, one hundred sixty-four thousand, eight hundred ninety-nine".