220402431 has 16 divisors (see below), whose sum is σ = 328876800. Its totient is φ = 145875384.

The previous prime is 220402423. The next prime is 220402459. The reversal of 220402431 is 134204022.

220402431 is a `hidden beast` number, since 220 + 402 + 43 + 1 = 666.

It is not a de Polignac number, because 220402431 - 2³ = 220402423 is a prime.

It is a super-2 number, since 2×220402431² = 97154463181419522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220402421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25611 + ... + 33116.

It is an arithmetic number, because the mean of its divisors is an integer number (20554800).

Almost surely, 2^220402431 is an apocalyptic number.

220402431 is a deficient number, since it is larger than the sum of its proper divisors (108474369).

220402431 is a wasteful number, since it uses less digits than its factorization.

220402431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58875 (or 58869 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 220402431 is about 14845.9567222864. The cubic root of 220402431 is about 604.0489403424.

Adding to 220402431 its reverse (134204022), we get a palindrome (354606453).

The spelling of 220402431 in words is "two hundred twenty million, four hundred two thousand, four hundred thirty-one".