20881432 has 32 divisors (see below), whose sum is σ = 46000080. Its totient is φ = 8760960.

The previous prime is 20881381. The next prime is 20881433. The reversal of 20881432 is 23418802.

It is a self number, because there is not a number n which added to its sum of digits gives 20881432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7983 + ... + 10270.

Almost surely, 2^20881432 is an apocalyptic number.

20881432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20881432 is an abundant number, since it is smaller than the sum of its proper divisors (25118648).

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

20881432 is a wasteful number, since it uses less digits than its factorization.

20881432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18283 (or 18279 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 20881432 is about 4569.6205531751. The cubic root of 20881432 is about 275.3721990498.

The spelling of 20881432 in words is "twenty million, eight hundred eighty-one thousand, four hundred thirty-two".