20556225631 has 8 divisors (see below), whose sum is σ = 21875903280. Its totient is φ = 19248824448.

The previous prime is 20556225611. The next prime is 20556225649. The reversal of 20556225631 is 13652265502.

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

It is a cyclic number.

It is not a de Polignac number, because 20556225631 - 2¹⁵ = 20556192863 is a prime.

It is a super-2 number, since 2×20556225631² (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 (20556225611) 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, 3065661 + ... + 3072358.

It is an arithmetic number, because the mean of its divisors is an integer number (2734487910).

Almost surely, 2^20556225631 is an apocalyptic number.

20556225631 is a deficient number, since it is larger than the sum of its proper divisors (1319677649).

20556225631 is a wasteful number, since it uses less digits than its factorization.

20556225631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6138233.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 20556225631 in words is "twenty billion, five hundred fifty-six million, two hundred twenty-five thousand, six hundred thirty-one".