20979908 has 12 divisors (see below), whose sum is σ = 37218300. Its totient is φ = 10346112.

The previous prime is 20979899. The next prime is 20979923. The reversal of 20979908 is 80997902.

It can be written as a sum of positive squares in 2 ways, for example, as 18130564 + 2849344 = 4258^2 + 1688^2 .

It is a super-3 number, since 3×20979908³ (a number of 23 digits) contains 333 as substring.

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, 35633 + ... + 36216.

It is an arithmetic number, because the mean of its divisors is an integer number (3101525).

Almost surely, 2^20979908 is an apocalyptic number.

It is an amenable number.

20979908 is a deficient number, since it is larger than the sum of its proper divisors (16238392).

20979908 is a wasteful number, since it uses less digits than its factorization.

20979908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71926 (or 71924 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 20979908 is about 4580.3829534221. The cubic root of 20979908 is about 275.8044017771.

The spelling of 20979908 in words is "twenty million, nine hundred seventy-nine thousand, nine hundred eight".