20677655 has 4 divisors (see below), whose sum is σ = 24813192. Its totient is φ = 16542120.

The previous prime is 20677649. The next prime is 20677663. The reversal of 20677655 is 55677602.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20677655 - 2⁴ = 20677639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2067761 + ... + 2067770.

It is an arithmetic number, because the mean of its divisors is an integer number (6203298).

Almost surely, 2^20677655 is an apocalyptic number.

20677655 is a deficient number, since it is larger than the sum of its proper divisors (4135537).

20677655 is an equidigital number, since it uses as much as digits as its factorization.

20677655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4135536.

The product of its (nonzero) digits is 88200, while the sum is 38.

The square root of 20677655 is about 4547.2689605960. The cubic root of 20677655 is about 274.4735050511.

The spelling of 20677655 in words is "twenty million, six hundred seventy-seven thousand, six hundred fifty-five".