20776580 has 24 divisors (see below), whose sum is σ = 47597760. Its totient is φ = 7555040.

The previous prime is 20776579. The next prime is 20776589. The reversal of 20776580 is 8567702.

It is a self number, because there is not a number n which added to its sum of digits gives 20776580.

It is not an unprimeable number, because it can be changed into a prime (20776589) 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, 47000 + ... + 47439.

It is an arithmetic number, because the mean of its divisors is an integer number (1983240).

Almost surely, 2^20776580 is an apocalyptic number.

20776580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20776580 is an abundant number, since it is smaller than the sum of its proper divisors (26821180).

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

20776580 is a wasteful number, since it uses less digits than its factorization.

20776580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94459 (or 94457 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 20776580 is about 4558.1333898867. The cubic root of 20776580 is about 274.9105163402.

The spelling of 20776580 in words is "twenty million, seven hundred seventy-six thousand, five hundred eighty".