20381924 has 12 divisors (see below), whose sum is σ = 35745024. Its totient is φ = 10169064.

The previous prime is 20381909. The next prime is 20381939. The reversal of 20381924 is 42918302.

It is an interprime number because it is at equal distance from previous prime (20381909) and next prime (20381939).

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, 3284 + ... + 7179.

It is an arithmetic number, because the mean of its divisors is an integer number (2978752).

Almost surely, 2^20381924 is an apocalyptic number.

It is an amenable number.

20381924 is a deficient number, since it is larger than the sum of its proper divisors (15363100).

20381924 is a wasteful number, since it uses less digits than its factorization.

20381924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10954 (or 10952 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20381924 is about 4514.6344259530. The cubic root of 20381924 is about 273.1587139025.

The spelling of 20381924 in words is "twenty million, three hundred eighty-one thousand, nine hundred twenty-four".