20644632 has 40 divisors (see below), whose sum is σ = 57825900. Its totient is φ = 6881328.

The previous prime is 20644627. The next prime is 20644633. The reversal of 20644632 is 23644602.

20644632 is a `hidden beast` number, since 20 + 6 + 4 + 4 + 632 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20644596 and 20644605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644633) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 15282 + ... + 16577.

Almost surely, 2^20644632 is an apocalyptic number.

It is an amenable number.

20644632 is an abundant number, since it is smaller than the sum of its proper divisors (37181268).

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

20644632 is a wasteful number, since it uses less digits than its factorization.

20644632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31877 (or 31864 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 20644632 is about 4543.6364291171. The cubic root of 20644632 is about 274.3273123293.

The spelling of 20644632 in words is "twenty million, six hundred forty-four thousand, six hundred thirty-two".