204020311 has 4 divisors (see below), whose sum is σ = 222567624. Its totient is φ = 185473000.

The previous prime is 204020291. The next prime is 204020329. The reversal of 204020311 is 113020402.

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

It is a cyclic number.

It is not a de Polignac number, because 204020311 - 2¹⁷ = 203889239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204020291 and 204020300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204020351) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9273640 + ... + 9273661.

It is an arithmetic number, because the mean of its divisors is an integer number (55641906).

Almost surely, 2^204020311 is an apocalyptic number.

204020311 is a deficient number, since it is larger than the sum of its proper divisors (18547313).

204020311 is a wasteful number, since it uses less digits than its factorization.

204020311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18547312.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 204020311 is about 14283.5678666081. The cubic root of 204020311 is about 588.6960679828.

Adding to 204020311 its reverse (113020402), we get a palindrome (317040713).

Subtracting from 204020311 its reverse (113020402), we obtain a palindrome (90999909).

The spelling of 204020311 in words is "two hundred four million, twenty thousand, three hundred eleven".