20988756628980 has 72 divisors (see below), whose sum is σ = 68363378743968. Its totient is φ = 4797430085952.

The previous prime is 20988756628913. The next prime is 20988756628991. The reversal of 20988756628980 is 8982665788902.

It is a junction number, because it is equal to n+sod(n) for n = 20988756628896 and 20988756628905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3569513494 + ... + 3569519373.

It is an arithmetic number, because the mean of its divisors is an integer number (949491371444).

Almost surely, 2^{20988756628980} is an apocalyptic number.

20988756628980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20988756628980 is an abundant number, since it is smaller than the sum of its proper divisors (47374622114988).

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

20988756628980 is a wasteful number, since it uses less digits than its factorization.

20988756628980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7139032893 (or 7139032884 counting only the distinct ones).

The product of its (nonzero) digits is 1672151040, while the sum is 78.

The spelling of 20988756628980 in words is "twenty trillion, nine hundred eighty-eight billion, seven hundred fifty-six million, six hundred twenty-eight thousand, nine hundred eighty".