20855677 has 4 divisors (see below), whose sum is σ = 20865600. Its totient is φ = 20845756.

The previous prime is 20855663. The next prime is 20855689. The reversal of 20855677 is 77655802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20855677 - 2¹¹ = 20853629 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20855657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427 + ... + 6472.

It is an arithmetic number, because the mean of its divisors is an integer number (5216400).

Almost surely, 2^20855677 is an apocalyptic number.

It is an amenable number.

20855677 is a deficient number, since it is larger than the sum of its proper divisors (9923).

20855677 is an equidigital number, since it uses as much as digits as its factorization.

20855677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9922.

The product of its (nonzero) digits is 117600, while the sum is 40.

The square root of 20855677 is about 4566.8016160109. The cubic root of 20855677 is about 275.2589384776.

It can be divided in two parts, 2085 and 5677, that multiplied together give a triangular number (11836545 = T₄₈₆₅).

The spelling of 20855677 in words is "twenty million, eight hundred fifty-five thousand, six hundred seventy-seven".