20887677 has 18 divisors (see below), whose sum is σ = 30618042. Its totient is φ = 13721664.

The previous prime is 20887673. The next prime is 20887687. The reversal of 20887677 is 77678802.

It can be written as a sum of positive squares in 3 ways, for example, as 2277081 + 18610596 = 1509^2 + 4314^2 .

It is not a de Polignac number, because 20887677 - 2² = 20887673 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887673) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 71143 + ... + 71435.

Almost surely, 2^20887677 is an apocalyptic number.

It is an amenable number.

20887677 is a deficient number, since it is larger than the sum of its proper divisors (9730365).

20887677 is an equidigital number, since it uses as much as digits as its factorization.

20887677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 20887677 is about 4570.3038192225. The cubic root of 20887677 is about 275.3996481248.

Subtracting from 20887677 its product of nonzero digits (263424), we obtain a triangular number (20624253 = T₆₄₂₂).

The spelling of 20887677 in words is "twenty million, eight hundred eighty-seven thousand, six hundred seventy-seven".