20887756580 has 12 divisors (see below), whose sum is σ = 43864288860. Its totient is φ = 8355102624.

The previous prime is 20887756553. The next prime is 20887756633. The reversal of 20887756580 is 8565778802.

It can be written as a sum of positive squares in 2 ways, for example, as 2118208576 + 18769548004 = 46024^2 + 137002^2 .

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 3 ways as a sum of consecutive naturals, for example, 522193895 + ... + 522193934.

It is an arithmetic number, because the mean of its divisors is an integer number (3655357405).

Almost surely, 2^20887756580 is an apocalyptic number.

20887756580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20887756580 is an abundant number, since it is smaller than the sum of its proper divisors (22976532280).

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

20887756580 is a wasteful number, since it uses less digits than its factorization.

20887756580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044387838 (or 1044387836 counting only the distinct ones).

The product of its (nonzero) digits is 7526400, while the sum is 56.

The spelling of 20887756580 in words is "twenty billion, eight hundred eighty-seven million, seven hundred fifty-six thousand, five hundred eighty".