20391932 has 12 divisors (see below), whose sum is σ = 38930136. Its totient is φ = 9269040.

The previous prime is 20391929. The next prime is 20391967. The reversal of 20391932 is 23919302.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20391895 and 20391904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231683 + ... + 231770.

It is an arithmetic number, because the mean of its divisors is an integer number (3244178).

Almost surely, 2^20391932 is an apocalyptic number.

20391932 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20391932 is a deficient number, since it is larger than the sum of its proper divisors (18538204).

20391932 is a wasteful number, since it uses less digits than its factorization.

20391932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463468 (or 463466 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 20391932 is about 4515.7426853177. The cubic root of 20391932 is about 273.2034156863.

The spelling of 20391932 in words is "twenty million, three hundred ninety-one thousand, nine hundred thirty-two".