20877538 has 16 divisors (see below), whose sum is σ = 34241760. Its totient is φ = 9468000.

The previous prime is 20877517. The next prime is 20877551. The reversal of 20877538 is 83577802.

It is a self number, because there is not a number n which added to its sum of digits gives 20877538.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12433 + ... + 14011.

It is an arithmetic number, because the mean of its divisors is an integer number (2140110).

Almost surely, 2^20877538 is an apocalyptic number.

20877538 is a deficient number, since it is larger than the sum of its proper divisors (13364222).

20877538 is a wasteful number, since it uses less digits than its factorization.

20877538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 20877538 is about 4569.1944585452. The cubic root of 20877538 is about 275.3550807155.

The spelling of 20877538 in words is "twenty million, eight hundred seventy-seven thousand, five hundred thirty-eight".