20979372 has 24 divisors (see below), whose sum is σ = 50146992. Its totient is φ = 6822400.

The previous prime is 20979367. The next prime is 20979373. The reversal of 20979372 is 27397902.

It is a self number, because there is not a number n which added to its sum of digits gives 20979372.

It is not an unprimeable number, because it can be changed into a prime (20979373) 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, 20829 + ... + 21812.

It is an arithmetic number, because the mean of its divisors is an integer number (2089458).

Almost surely, 2^20979372 is an apocalyptic number.

It is an amenable number.

20979372 is an abundant number, since it is smaller than the sum of its proper divisors (29167620).

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

20979372 is a wasteful number, since it uses less digits than its factorization.

20979372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42689 (or 42687 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 20979372 is about 4580.3244426569. The cubic root of 20979372 is about 275.8020529835.

The spelling of 20979372 in words is "twenty million, nine hundred seventy-nine thousand, three hundred seventy-two".