20731432 has 64 divisors (see below), whose sum is σ = 44323200. Its totient is φ = 9031680.

The previous prime is 20731429. The next prime is 20731453. The reversal of 20731432 is 23413702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183408 + ... + 183520.

It is an arithmetic number, because the mean of its divisors is an integer number (692550).

Almost surely, 2^20731432 is an apocalyptic number.

It is an amenable number.

20731432 is an abundant number, since it is smaller than the sum of its proper divisors (23591768).

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

20731432 is a wasteful number, since it uses less digits than its factorization.

20731432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20731432 is about 4553.1782306429. The cubic root of 20731432 is about 274.7112429092.

The spelling of 20731432 in words is "twenty million, seven hundred thirty-one thousand, four hundred thirty-two".