20396979 has 6 divisors (see below), whose sum is σ = 29462316. Its totient is φ = 13597980.

The previous prime is 20396963. The next prime is 20396983. The reversal of 20396979 is 97969302.

It is not a de Polignac number, because 20396979 - 2⁴ = 20396963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20396939) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1133157 + ... + 1133174.

It is an arithmetic number, because the mean of its divisors is an integer number (4910386).

Almost surely, 2^20396979 is an apocalyptic number.

20396979 is a deficient number, since it is larger than the sum of its proper divisors (9065337).

20396979 is a wasteful number, since it uses less digits than its factorization.

20396979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266337 (or 2266334 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 20396979 is about 4516.3014735511. The cubic root of 20396979 is about 273.2259530947.

The spelling of 20396979 in words is "twenty million, three hundred ninety-six thousand, nine hundred seventy-nine".