20631884 has 24 divisors (see below), whose sum is σ = 44438688. Its totient is φ = 8161920.

The previous prime is 20631869. The next prime is 20631899. The reversal of 20631884 is 48813602.

It is an interprime number because it is at equal distance from previous prime (20631869) and next prime (20631899).

It is a self number, because there is not a number n which added to its sum of digits gives 20631884.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27977 + ... + 28704.

It is an arithmetic number, because the mean of its divisors is an integer number (1851612).

Almost surely, 2^20631884 is an apocalyptic number.

It is an amenable number.

20631884 is an abundant number, since it is smaller than the sum of its proper divisors (23806804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20631884 is a wasteful number, since it uses less digits than its factorization.

20631884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56705 (or 56703 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 20631884 is about 4542.2333713714. The cubic root of 20631884 is about 274.2708352647.

The spelling of 20631884 in words is "twenty million, six hundred thirty-one thousand, eight hundred eighty-four".