20972631 has 8 divisors (see below), whose sum is σ = 28013040. Its totient is φ = 13956992.

The previous prime is 20972621. The next prime is 20972639. The reversal of 20972631 is 13627902.

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 20972631 - 2¹³ = 20964439 is a prime.

It is a super-2 number, since 2×20972631² = 879702502124322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20972639) 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, 4116 + ... + 7673.

It is an arithmetic number, because the mean of its divisors is an integer number (3501630).

Almost surely, 2^20972631 is an apocalyptic number.

20972631 is a deficient number, since it is larger than the sum of its proper divisors (7040409).

20972631 is a wasteful number, since it uses less digits than its factorization.

20972631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12385.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 20972631 is about 4579.5885186335. The cubic root of 20972631 is about 275.7725099828.

The spelling of 20972631 in words is "twenty million, nine hundred seventy-two thousand, six hundred thirty-one".