20979384 has 32 divisors (see below), whose sum is σ = 52869120. Its totient is φ = 6937056.

The previous prime is 20979373. The next prime is 20979389. The reversal of 20979384 is 48397902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20979389) 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, 394 + ... + 6489.

It is an arithmetic number, because the mean of its divisors is an integer number (1652160).

Almost surely, 2^20979384 is an apocalyptic number.

20979384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20979384 is an abundant number, since it is smaller than the sum of its proper divisors (31889736).

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

20979384 is a wasteful number, since it uses less digits than its factorization.

20979384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7019 (or 7015 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 20979384 is about 4580.3257526076. The cubic root of 20979384 is about 275.8021055689.

The spelling of 20979384 in words is "twenty million, nine hundred seventy-nine thousand, three hundred eighty-four".