220405031 has 32 divisors (see below), whose sum is σ = 281829888. Its totient is φ = 167408640.

The previous prime is 220405019. The next prime is 220405063. The reversal of 220405031 is 130504022.

220405031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 220405031 - 2¹⁰ = 220404007 is a prime.

It is a super-2 number, since 2×220405031² = 97156755380221922, 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 (220405001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 635000 + ... + 635346.

It is an arithmetic number, because the mean of its divisors is an integer number (8807184).

Almost surely, 2^220405031 is an apocalyptic number.

220405031 is a deficient number, since it is larger than the sum of its proper divisors (61424857).

220405031 is a wasteful number, since it uses less digits than its factorization.

220405031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 220405031 is about 14846.0442879577. The cubic root of 220405031 is about 604.0513155749.

Adding to 220405031 its reverse (130504022), we get a palindrome (350909053).

The spelling of 220405031 in words is "two hundred twenty million, four hundred five thousand, thirty-one".