20677845 has 16 divisors (see below), whose sum is σ = 33390720. Its totient is φ = 10926144.

The previous prime is 20677823. The next prime is 20677859. The reversal of 20677845 is 54877602.

It is not a de Polignac number, because 20677845 - 2⁷ = 20677717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4689 + ... + 7958.

It is an arithmetic number, because the mean of its divisors is an integer number (2086920).

Almost surely, 2^20677845 is an apocalyptic number.

It is an amenable number.

20677845 is a deficient number, since it is larger than the sum of its proper divisors (12712875).

20677845 is a wasteful number, since it uses less digits than its factorization.

20677845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12764.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 20677845 is about 4547.2898522087. The cubic root of 20677845 is about 274.4743457301.

The spelling of 20677845 in words is "twenty million, six hundred seventy-seven thousand, eight hundred forty-five".