220120031 has 4 divisors (see below), whose sum is σ = 220227000. Its totient is φ = 220013064.

The previous prime is 220120027. The next prime is 220120049. The reversal of 220120031 is 130021022.

It is a happy number.

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 220120031 - 2² = 220120027 is a prime.

It is a super-2 number, since 2×220120031² = 96905656094881922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220119994 and 220120021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220120081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50336 + ... + 54533.

It is an arithmetic number, because the mean of its divisors is an integer number (55056750).

Almost surely, 2^220120031 is an apocalyptic number.

220120031 is a deficient number, since it is larger than the sum of its proper divisors (106969).

220120031 is a wasteful number, since it uses less digits than its factorization.

220120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106968.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 220120031 is about 14836.4426666233. The cubic root of 220120031 is about 603.7908422690.

Adding to 220120031 its reverse (130021022), we get a palindrome (350141053).

Subtracting from 220120031 its reverse (130021022), we obtain a palindrome (90099009).

The spelling of 220120031 in words is "two hundred twenty million, one hundred twenty thousand, thirty-one".