20204431 has 8 divisors (see below), whose sum is σ = 22289904. Its totient is φ = 18194880.

The previous prime is 20204417. The next prime is 20204477. The reversal of 20204431 is 13440202.

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 20204431 - 2⁹ = 20203919 is a prime.

It is a super-2 number, since 2×20204431² = 816438064067522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20204411) 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 7 ways as a sum of consecutive naturals, for example, 18421 + ... + 19486.

It is an arithmetic number, because the mean of its divisors is an integer number (2786238).

Almost surely, 2^20204431 is an apocalyptic number.

20204431 is a deficient number, since it is larger than the sum of its proper divisors (2085473).

20204431 is a wasteful number, since it uses less digits than its factorization.

20204431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37961.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 20204431 is about 4494.9339260995. The cubic root of 20204431 is about 272.3634801391.

Adding to 20204431 its reverse (13440202), we get a palindrome (33644633).

The spelling of 20204431 in words is "twenty million, two hundred four thousand, four hundred thirty-one".