20877481 has 2 divisors, whose sum is σ = 20877482. Its totient is φ = 20877480.

The previous prime is 20877449. The next prime is 20877497. The reversal of 20877481 is 18477802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14707225 + 6170256 = 3835^2 + 2484^2 .

It is a cyclic number.

It is not a de Polignac number, because 20877481 - 2⁵ = 20877449 is a prime.

It is a super-2 number, since 2×20877481² = 871738425810722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20877481.

It is not a weakly prime, because it can be changed into another prime (20877431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10438740 + 10438741.

It is an arithmetic number, because the mean of its divisors is an integer number (10438741).

Almost surely, 2^20877481 is an apocalyptic number.

It is an amenable number.

20877481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20877481 is an equidigital number, since it uses as much as digits as its factorization.

20877481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 20877481 is about 4569.1882211176. The cubic root of 20877481 is about 275.3548301231.

The spelling of 20877481 in words is "twenty million, eight hundred seventy-seven thousand, four hundred eighty-one".