79920020 has 18 divisors (see below), whose sum is σ = 167916042. Its totient is φ = 31952016.

The previous prime is 79920019. The next prime is 79920047. The reversal of 79920020 is 2002997.

It is a happy number.

79920020 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 63936016 + 15984004 = 7996^2 + 3998^2 .

79920020 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38981 + ... + 40979.

It is an arithmetic number, because the mean of its divisors is an integer number (9328669).

Almost surely, 2^79920020 is an apocalyptic number.

It is an amenable number.

79920020 is an abundant number, since it is smaller than the sum of its proper divisors (87996022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79920020 is an equidigital number, since it uses as much as digits as its factorization.

79920020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 79920020 is about 8939.7997740442. The cubic root of 79920020 is about 430.7432970553.

The spelling of 79920020 in words is "seventy-nine million, nine hundred twenty thousand, twenty".