20210979 has 8 divisors (see below), whose sum is σ = 26972352. Its totient is φ = 13461800.

The previous prime is 20210963. The next prime is 20211001. The reversal of 20210979 is 97901202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20210979 - 2⁴ = 20210963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20210929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2032 + ... + 6674.

It is an arithmetic number, because the mean of its divisors is an integer number (3371544).

Almost surely, 2^20210979 is an apocalyptic number.

20210979 is a deficient number, since it is larger than the sum of its proper divisors (6761373).

20210979 is a wasteful number, since it uses less digits than its factorization.

20210979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6097.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 20210979 is about 4495.6622426512. The cubic root of 20210979 is about 272.3929001451.

The spelling of 20210979 in words is "twenty million, two hundred ten thousand, nine hundred seventy-nine".