20344979 has 16 divisors (see below), whose sum is σ = 21954240. Its totient is φ = 18816000.

The previous prime is 20344969. The next prime is 20344981. The reversal of 20344979 is 97944302.

It is a cyclic number.

It is not a de Polignac number, because 20344979 - 2⁴ = 20344963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20344969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84299 + ... + 84539.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

Almost surely, 2^20344979 is an apocalyptic number.

20344979 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20344979 is a deficient number, since it is larger than the sum of its proper divisors (1609261).

20344979 is a wasteful number, since it uses less digits than its factorization.

20344979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 20344979 is about 4510.5408766577. The cubic root of 20344979 is about 272.9935683475.

The spelling of 20344979 in words is "twenty million, three hundred forty-four thousand, nine hundred seventy-nine".