20379864 has 16 divisors (see below), whose sum is σ = 50949720. Its totient is φ = 6793280.

The previous prime is 20379841. The next prime is 20379899. The reversal of 20379864 is 46897302.

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, 424557 + ... + 424604.

Almost surely, 2^20379864 is an apocalyptic number.

20379864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20379864 is an abundant number, since it is smaller than the sum of its proper divisors (30569856).

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

20379864 is a wasteful number, since it uses less digits than its factorization.

20379864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849170 (or 849166 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 20379864 is about 4514.4062732545. The cubic root of 20379864 is about 273.1495108801.

The spelling of 20379864 in words is "twenty million, three hundred seventy-nine thousand, eight hundred sixty-four".