20572670665 has 8 divisors (see below), whose sum is σ = 24720435648. Its totient is φ = 16435982640.

The previous prime is 20572670663. The next prime is 20572670669. The reversal of 20572670665 is 56607627502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20572670665 - 2¹ = 20572670663 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 2765151 + ... + 2772580.

It is an arithmetic number, because the mean of its divisors is an integer number (3090054456).

Almost surely, 2^20572670665 is an apocalyptic number.

It is an amenable number.

20572670665 is a deficient number, since it is larger than the sum of its proper divisors (4147764983).

20572670665 is an equidigital number, since it uses as much as digits as its factorization.

20572670665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5538479.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 20572670665 in words is "twenty billion, five hundred seventy-two million, six hundred seventy thousand, six hundred sixty-five".