220031406 has 24 divisors (see below), whose sum is σ = 544839984. Its totient is φ = 62866080.

The previous prime is 220031401. The next prime is 220031411. The reversal of 220031406 is 604130022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (220031401) and next prime (220031411).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220031401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 873015 + ... + 873266.

It is an arithmetic number, because the mean of its divisors is an integer number (22701666).

Almost surely, 2^220031406 is an apocalyptic number.

220031406 is an abundant number, since it is smaller than the sum of its proper divisors (324808578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220031406 is a wasteful number, since it uses less digits than its factorization.

220031406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746296 (or 1746293 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 220031406 is about 14833.4556324546. The cubic root of 220031406 is about 603.7097983854.

Adding to 220031406 its reverse (604130022), we get a palindrome (824161428).

It can be divided in two parts, 22003 and 1406, that added together give a square (23409 = 153²).

The spelling of 220031406 in words is "two hundred twenty million, thirty-one thousand, four hundred six".