20860631 has 4 divisors (see below), whose sum is σ = 22757064. Its totient is φ = 18964200.

The previous prime is 20860627. The next prime is 20860643. The reversal of 20860631 is 13606802.

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

It is a cyclic number.

It is not a de Polignac number, because 20860631 - 2² = 20860627 is a prime.

It is a super-2 number, since 2×20860631² = 870331851436322, 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 20860631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20860601) 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, 948200 + ... + 948221.

It is an arithmetic number, because the mean of its divisors is an integer number (5689266).

Almost surely, 2^20860631 is an apocalyptic number.

20860631 is a deficient number, since it is larger than the sum of its proper divisors (1896433).

20860631 is a wasteful number, since it uses less digits than its factorization.

20860631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896432.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 20860631 is about 4567.3439765360. The cubic root of 20860631 is about 275.2807315018.

The spelling of 20860631 in words is "twenty million, eight hundred sixty thousand, six hundred thirty-one".