220401031 has 4 divisors (see below), whose sum is σ = 220473792. Its totient is φ = 220328272.

The previous prime is 220401023. The next prime is 220401037. The reversal of 220401031 is 130104022.

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 220401031 - 2³ = 220401023 is a prime.

It is a super-2 number, since 2×220401031² = 97153228931725922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220401037) 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, 31630 + ... + 37963.

It is an arithmetic number, because the mean of its divisors is an integer number (55118448).

Almost surely, 2^220401031 is an apocalyptic number.

220401031 is a deficient number, since it is larger than the sum of its proper divisors (72761).

220401031 is an equidigital number, since it uses as much as digits as its factorization.

220401031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72760.

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

The square root of 220401031 is about 14845.9095713264. The cubic root of 220401031 is about 604.0476613633.

Adding to 220401031 its reverse (130104022), we get a palindrome (350505053).

The spelling of 220401031 in words is "two hundred twenty million, four hundred one thousand, thirty-one".