20877138 has 24 divisors (see below), whose sum is σ = 45419868. Its totient is φ = 6930432.

The previous prime is 20877137. The next prime is 20877151. The reversal of 20877138 is 83177802.

It can be written as a sum of positive squares in 2 ways, for example, as 20820969 + 56169 = 4563^2 + 237^2 .

It is not an unprimeable number, because it can be changed into a prime (20877137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2370 + ... + 6882.

Almost surely, 2^20877138 is an apocalyptic number.

20877138 is an abundant number, since it is smaller than the sum of its proper divisors (24542730).

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

20877138 is a wasteful number, since it uses less digits than its factorization.

20877138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778 (or 4775 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 20877138 is about 4569.1506869439. The cubic root of 20877138 is about 275.3533221630.

The spelling of 20877138 in words is "twenty million, eight hundred seventy-seven thousand, one hundred thirty-eight".