20724879 has 16 divisors (see below), whose sum is σ = 32670720. Its totient is φ = 11434080.

The previous prime is 20724841. The next prime is 20724889. The reversal of 20724879 is 97842702.

It is not a de Polignac number, because 20724879 - 2⁹ = 20724367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724889) 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, 16407 + ... + 17624.

It is an arithmetic number, because the mean of its divisors is an integer number (2041920).

Almost surely, 2^20724879 is an apocalyptic number.

20724879 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20724879 is a deficient number, since it is larger than the sum of its proper divisors (11945841).

20724879 is a wasteful number, since it uses less digits than its factorization.

20724879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34070.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 20724879 is about 4552.4585665330. The cubic root of 20724879 is about 274.6822953594.

The spelling of 20724879 in words is "twenty million, seven hundred twenty-four thousand, eight hundred seventy-nine".