20572670666 has 32 divisors (see below), whose sum is σ = 34505751168. Its totient is φ = 9148733440.

The previous prime is 20572670663. The next prime is 20572670669. The reversal of 20572670666 is 66607627502.

It is an interprime number because it is at equal distance from previous prime (20572670663) and next prime (20572670669).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20572670666.

It is not an unprimeable number, because it can be changed into a prime (20572670663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93575 + ... + 223386.

It is an arithmetic number, because the mean of its divisors is an integer number (1078304724).

Almost surely, 2^20572670666 is an apocalyptic number.

20572670666 is a deficient number, since it is larger than the sum of its proper divisors (13933080502).

20572670666 is a wasteful number, since it uses less digits than its factorization.

20572670666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317086.

The product of its (nonzero) digits is 1270080, while the sum is 47.

The spelling of 20572670666 in words is "twenty billion, five hundred seventy-two million, six hundred seventy thousand, six hundred sixty-six".