20338979 has 2 divisors, whose sum is σ = 20338980. Its totient is φ = 20338978.

The previous prime is 20338951. The next prime is 20339009. The reversal of 20338979 is 97983302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20338979 is a prime.

It is not a weakly prime, because it can be changed into another prime (20332979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10169489 + 10169490.

It is an arithmetic number, because the mean of its divisors is an integer number (10169490).

Almost surely, 2^20338979 is an apocalyptic number.

20338979 is a deficient number, since it is larger than the sum of its proper divisors (1).

20338979 is an equidigital number, since it uses as much as digits as its factorization.

20338979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 20338979 is about 4509.8757189084. The cubic root of 20338979 is about 272.9667292528.

The spelling of 20338979 in words is "twenty million, three hundred thirty-eight thousand, nine hundred seventy-nine".