204021679 has 6 divisors (see below), whose sum is σ = 206032416. Its totient is φ = 202030380.

The previous prime is 204021667. The next prime is 204021691. The reversal of 204021679 is 976120402.

It is an interprime number because it is at equal distance from previous prime (204021667) and next prime (204021691).

It is not a de Polignac number, because 204021679 - 2⁵ = 204021647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 204021679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204021619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 994 + ... + 20224.

It is an arithmetic number, because the mean of its divisors is an integer number (34338736).

Almost surely, 2^204021679 is an apocalyptic number.

204021679 is a deficient number, since it is larger than the sum of its proper divisors (2010737).

204021679 is an equidigital number, since it uses as much as digits as its factorization.

204021679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19437 (or 19334 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 204021679 is about 14283.6157537229. The cubic root of 204021679 is about 588.6973837578.

The spelling of 204021679 in words is "two hundred four million, twenty-one thousand, six hundred seventy-nine".