20460979 has 48 divisors (see below), whose sum is σ = 28728000. Its totient is φ = 14488320.

The previous prime is 20460977. The next prime is 20460989. The reversal of 20460979 is 97906402.

It is not a de Polignac number, because 20460979 - 2¹ = 20460977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20460977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 705537 + ... + 705565.

It is an arithmetic number, because the mean of its divisors is an integer number (598500).

Almost surely, 2^20460979 is an apocalyptic number.

20460979 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20460979 is a deficient number, since it is larger than the sum of its proper divisors (8267021).

20460979 is a wasteful number, since it uses less digits than its factorization.

20460979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 20460979 is about 4523.3813679592. The cubic root of 20460979 is about 273.5114235331.

The spelling of 20460979 in words is "twenty million, four hundred sixty thousand, nine hundred seventy-nine".