20779080 has 128 divisors (see below), whose sum is σ = 73785600. Its totient is φ = 4580352.

The previous prime is 20779063. The next prime is 20779091. The reversal of 20779080 is 8097702.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23934 + ... + 24786.

It is an arithmetic number, because the mean of its divisors is an integer number (576450).

Almost surely, 2^20779080 is an apocalyptic number.

20779080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20779080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36892800).

20779080 is an abundant number, since it is smaller than the sum of its proper divisors (53006520).

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

20779080 is a wasteful number, since it uses less digits than its factorization.

20779080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 20779080 is about 4558.4076167013. The cubic root of 20779080 is about 274.9215423564.

The spelling of 20779080 in words is "twenty million, seven hundred seventy-nine thousand, eighty".