20970631 has 12 divisors (see below), whose sum is σ = 23384592. Its totient is φ = 18788000.

The previous prime is 20970617. The next prime is 20970643. The reversal of 20970631 is 13607902.

It is not a de Polignac number, because 20970631 - 2¹¹ = 20968583 is a prime.

It is a super-2 number, since 2×20970631² = 879534729076322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20970631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20970331) 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 11 ways as a sum of consecutive naturals, for example, 7371 + ... + 9811.

It is an arithmetic number, because the mean of its divisors is an integer number (1948716).

Almost surely, 2^20970631 is an apocalyptic number.

20970631 is a deficient number, since it is larger than the sum of its proper divisors (2413961).

20970631 is a wasteful number, since it uses less digits than its factorization.

20970631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2534 (or 2523 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 20970631 is about 4579.3701531979. The cubic root of 20970631 is about 275.7637435966.

The spelling of 20970631 in words is "twenty million, nine hundred seventy thousand, six hundred thirty-one".