20979650 has 24 divisors (see below), whose sum is σ = 39332304. Its totient is φ = 8325200.

The previous prime is 20979641. The next prime is 20979671. The reversal of 20979650 is 5697902.

20979650 = T₁₂₈₃ + T₁₂₈₄ + ... + T₁₃₀₇.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4949 + ... + 8151.

It is an arithmetic number, because the mean of its divisors is an integer number (1638846).

Almost surely, 2^20979650 is an apocalyptic number.

20979650 is a deficient number, since it is larger than the sum of its proper divisors (18352654).

20979650 is a wasteful number, since it uses less digits than its factorization.

20979650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3346 (or 3341 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 20979650 is about 4580.3547897516. The cubic root of 20979650 is about 275.8032712061.

The spelling of 20979650 in words is "twenty million, nine hundred seventy-nine thousand, six hundred fifty".