20572577421 has 72 divisors (see below), whose sum is σ = 32816364672. Its totient is φ = 11446195200.

The previous prime is 20572577407. The next prime is 20572577429. The reversal of 20572577421 is 12477527502.

It is a happy number.

It is not a de Polignac number, because 20572577421 - 2³⁰ = 19498835597 is a prime.

It is a super-2 number, since 2×20572577421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572577429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4298796 + ... + 4303578.

Almost surely, 2^20572577421 is an apocalyptic number.

It is an amenable number.

20572577421 is a deficient number, since it is larger than the sum of its proper divisors (12243787251).

20572577421 is a wasteful number, since it uses less digits than its factorization.

20572577421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4883 (or 4855 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 42.

The spelling of 20572577421 in words is "twenty billion, five hundred seventy-two million, five hundred seventy-seven thousand, four hundred twenty-one".