20887756424 has 8 divisors (see below), whose sum is σ = 39164543310. Its totient is φ = 10443878208.

The previous prime is 20887756399. The next prime is 20887756433. The reversal of 20887756424 is 42465778802.

It can be written as a sum of positive squares in only one way, i.e., 20798831524 + 88924900 = 144218^2 + 9430^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1305484769 + ... + 1305484784.

Almost surely, 2^20887756424 is an apocalyptic number.

It is an amenable number.

20887756424 is a deficient number, since it is larger than the sum of its proper divisors (18276786886).

20887756424 is a wasteful number, since it uses less digits than its factorization.

20887756424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610969559 (or 2610969555 counting only the distinct ones).

The product of its (nonzero) digits is 6021120, while the sum is 53.

The spelling of 20887756424 in words is "twenty billion, eight hundred eighty-seven million, seven hundred fifty-six thousand, four hundred twenty-four".