20877812 has 6 divisors (see below), whose sum is σ = 36536178. Its totient is φ = 10438904.

The previous prime is 20877797. The next prime is 20877821. The reversal of 20877812 is 21877802.

It can be written as a sum of positive squares in only one way, i.e., 19044496 + 1833316 = 4364^2 + 1354^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2609723 + ... + 2609730.

It is an arithmetic number, because the mean of its divisors is an integer number (6089363).

Almost surely, 2^20877812 is an apocalyptic number.

It is an amenable number.

20877812 is a deficient number, since it is larger than the sum of its proper divisors (15658366).

20877812 is a wasteful number, since it uses less digits than its factorization.

20877812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5219457 (or 5219455 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 20877812 is about 4569.2244418501. The cubic root of 20877812 is about 275.3562853109.

The spelling of 20877812 in words is "twenty million, eight hundred seventy-seven thousand, eight hundred twelve".