20931324 has 24 divisors (see below), whose sum is σ = 50416128. Its totient is φ = 6751920.

The previous prime is 20931289. The next prime is 20931347. The reversal of 20931324 is 42313902.

It is a junction number, because it is equal to n+sod(n) for n = 20931294 and 20931303.

It is a congruent number.

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, 27762 + ... + 28505.

It is an arithmetic number, because the mean of its divisors is an integer number (2100672).

Almost surely, 2^20931324 is an apocalyptic number.

It is an amenable number.

20931324 is an abundant number, since it is smaller than the sum of its proper divisors (29484804).

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

20931324 is a wasteful number, since it uses less digits than its factorization.

20931324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56305 (or 56303 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20931324 is about 4575.0763928048. The cubic root of 20931324 is about 275.5913401854.

The spelling of 20931324 in words is "twenty million, nine hundred thirty-one thousand, three hundred twenty-four".