20877988 has 12 divisors (see below), whose sum is σ = 36739612. Its totient is φ = 10380960.

The previous prime is 20877971. The next prime is 20877991. The reversal of 20877988 is 88977802.

It can be written as a sum of positive squares in 2 ways, for example, as 5053504 + 15824484 = 2248^2 + 3978^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13695 + ... + 15142.

Almost surely, 2^20877988 is an apocalyptic number.

It is an amenable number.

20877988 is a deficient number, since it is larger than the sum of its proper divisors (15861624).

20877988 is a wasteful number, since it uses less digits than its factorization.

20877988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29022 (or 29020 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 49.

The square root of 20877988 is about 4569.2437010954. The cubic root of 20877988 is about 275.3570590601.

The spelling of 20877988 in words is "twenty million, eight hundred seventy-seven thousand, nine hundred eighty-eight".