20652979 has 4 divisors (see below), whose sum is σ = 20662840. Its totient is φ = 20643120.

The previous prime is 20652967. The next prime is 20653001. The reversal of 20652979 is 97925602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20652979 - 2²¹ = 18555827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20650979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402 + ... + 6439.

It is an arithmetic number, because the mean of its divisors is an integer number (5165710).

Almost surely, 2^20652979 is an apocalyptic number.

20652979 is a deficient number, since it is larger than the sum of its proper divisors (9861).

20652979 is an equidigital number, since it uses as much as digits as its factorization.

20652979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9860.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 20652979 is about 4544.5548736923. The cubic root of 20652979 is about 274.3642791874.

The spelling of 20652979 in words is "twenty million, six hundred fifty-two thousand, nine hundred seventy-nine".