20572631 has 4 divisors (see below), whose sum is σ = 20606592. Its totient is φ = 20538672.

The previous prime is 20572613. The next prime is 20572661. The reversal of 20572631 is 13627502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20572631 is a prime.

It is a super-2 number, since 2×20572631² = 846466292524322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20572631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20572661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16055 + ... + 17288.

It is an arithmetic number, because the mean of its divisors is an integer number (5151648).

Almost surely, 2^20572631 is an apocalyptic number.

20572631 is a deficient number, since it is larger than the sum of its proper divisors (33961).

20572631 is an equidigital number, since it uses as much as digits as its factorization.

20572631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33960.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20572631 is about 4535.7062294642. The cubic root of 20572631 is about 274.0080227462.

The spelling of 20572631 in words is "twenty million, five hundred seventy-two thousand, six hundred thirty-one".