20877490 has 16 divisors (see below), whose sum is σ = 37720152. Its totient is φ = 8319744.

The previous prime is 20877481. The next prime is 20877497. The reversal of 20877490 is 9477802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12680721 + 8196769 = 3561^2 + 2863^2 .

It is not an unprimeable number, because it can be changed into a prime (20877497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 999 + ... + 6538.

Almost surely, 2^20877490 is an apocalyptic number.

20877490 is a deficient number, since it is larger than the sum of its proper divisors (16842662).

20877490 is a wasteful number, since it uses less digits than its factorization.

20877490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7821.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 20877490 is about 4569.1892059752. The cubic root of 20877490 is about 275.3548696904.

The spelling of 20877490 in words is "twenty million, eight hundred seventy-seven thousand, four hundred ninety".