20979020 has 24 divisors (see below), whose sum is σ = 46648224. Its totient is φ = 7897856.

The previous prime is 20979019. The next prime is 20979029. The reversal of 20979020 is 2097902.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20979029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30512 + ... + 31191.

It is an arithmetic number, because the mean of its divisors is an integer number (1943676).

Almost surely, 2^20979020 is an apocalyptic number.

20979020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20979020 is an abundant number, since it is smaller than the sum of its proper divisors (25669204).

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

20979020 is a wasteful number, since it uses less digits than its factorization.

20979020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61729 (or 61727 counting only the distinct ones).

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

The square root of 20979020 is about 4580.2860172701. The cubic root of 20979020 is about 275.8005104704.

The spelling of 20979020 in words is "twenty million, nine hundred seventy-nine thousand, twenty".