20718365880 has 64 divisors (see below), whose sum is σ = 62240855040. Its totient is φ = 5517274752.

The previous prime is 20718365827. The next prime is 20718365893. The reversal of 20718365880 is 8856381702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31504 + ... + 205983.

It is an arithmetic number, because the mean of its divisors is an integer number (972513360).

Almost surely, 2^20718365880 is an apocalyptic number.

20718365880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20718365880 is an abundant number, since it is smaller than the sum of its proper divisors (41522489160).

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

20718365880 is a wasteful number, since it uses less digits than its factorization.

20718365880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238228 (or 238224 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 20718365880 in words is "twenty billion, seven hundred eighteen million, three hundred sixty-five thousand, eight hundred eighty".