20776880 has 40 divisors (see below), whose sum is σ = 50852400. Its totient is φ = 7872768.

The previous prime is 20776849. The next prime is 20776897. The reversal of 20776880 is 8867702.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5315 + ... + 8354.

It is an arithmetic number, because the mean of its divisors is an integer number (1271310).

Almost surely, 2^20776880 is an apocalyptic number.

20776880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20776880 is an abundant number, since it is smaller than the sum of its proper divisors (30075520).

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

20776880 is a wasteful number, since it uses less digits than its factorization.

20776880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13701 (or 13695 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 20776880 is about 4558.1662979755. The cubic root of 20776880 is about 274.9118395088.

The spelling of 20776880 in words is "twenty million, seven hundred seventy-six thousand, eight hundred eighty".