31493220 has 48 divisors (see below), whose sum is σ = 96199488. Its totient is φ = 7634560.

The previous prime is 31493201. The next prime is 31493249. The reversal of 31493220 is 2239413.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23199 + ... + 24518.

It is an arithmetic number, because the mean of its divisors is an integer number (2004156).

Almost surely, 2^31493220 is an apocalyptic number.

31493220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31493220 is an abundant number, since it is smaller than the sum of its proper divisors (64706268).

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

31493220 is a wasteful number, since it uses less digits than its factorization.

31493220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47740 (or 47738 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 31493220 is about 5611.8820372492. The cubic root of 31493220 is about 315.7953195701.

It can be divided in two parts, 31493 and 220, that added together give a palindrome (31713).

The spelling of 31493220 in words is "thirty-one million, four hundred ninety-three thousand, two hundred twenty".