20979398 has 16 divisors (see below), whose sum is σ = 34767360. Its totient is φ = 9414600.

The previous prime is 20979391. The next prime is 20979403. The reversal of 20979398 is 89397902.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20979391) 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, 4298 + ... + 7773.

It is an arithmetic number, because the mean of its divisors is an integer number (2172960).

Almost surely, 2^20979398 is an apocalyptic number.

20979398 is a deficient number, since it is larger than the sum of its proper divisors (13787962).

20979398 is a wasteful number, since it uses less digits than its factorization.

20979398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12163.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 20979398 is about 4580.3272808829. The cubic root of 20979398 is about 275.8021669184.

The spelling of 20979398 in words is "twenty million, nine hundred seventy-nine thousand, three hundred ninety-eight".