20631472 has 40 divisors (see below), whose sum is σ = 42800832. Its totient is φ = 9600000.

The previous prime is 20631467. The next prime is 20631491. The reversal of 20631472 is 27413602.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

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, 27097 + ... + 27847.

Almost surely, 2^20631472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20631472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21400416).

20631472 is an abundant number, since it is smaller than the sum of its proper divisors (22169360).

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

20631472 is a wasteful number, since it uses less digits than its factorization.

20631472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877 (or 871 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 20631472 is about 4542.1880190058. The cubic root of 20631472 is about 274.2690096060.

The spelling of 20631472 in words is "twenty million, six hundred thirty-one thousand, four hundred seventy-two".