20555679 has 8 divisors (see below), whose sum is σ = 27924912. Its totient is φ = 13445120.

The previous prime is 20555651. The next prime is 20555681. The reversal of 20555679 is 97655502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20555679 - 2⁷ = 20555551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20555699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64482 + ... + 64799.

It is an arithmetic number, because the mean of its divisors is an integer number (3490614).

Almost surely, 2^20555679 is an apocalyptic number.

20555679 is a deficient number, since it is larger than the sum of its proper divisors (7369233).

20555679 is a wasteful number, since it uses less digits than its factorization.

20555679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129337.

The product of its (nonzero) digits is 94500, while the sum is 39.

The square root of 20555679 is about 4533.8371166155. The cubic root of 20555679 is about 273.9327405194.

The spelling of 20555679 in words is "twenty million, five hundred fifty-five thousand, six hundred seventy-nine".