20572164889 has 2 divisors, whose sum is σ = 20572164890. Its totient is φ = 20572164888.

The previous prime is 20572164883. The next prime is 20572164911. The reversal of 20572164889 is 98846127502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19745027289 + 827137600 = 140517^2 + 28760^2 .

It is a cyclic number.

It is not a de Polignac number, because 20572164889 - 2³ = 20572164881 is a prime.

It is not a weakly prime, because it can be changed into another prime (20572164881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10286082444 + 10286082445.

It is an arithmetic number, because the mean of its divisors is an integer number (10286082445).

Almost surely, 2^20572164889 is an apocalyptic number.

It is an amenable number.

20572164889 is a deficient number, since it is larger than the sum of its proper divisors (1).

20572164889 is an equidigital number, since it uses as much as digits as its factorization.

20572164889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 20572164889 in words is "twenty billion, five hundred seventy-two million, one hundred sixty-four thousand, eight hundred eighty-nine".