220031656 has 16 divisors (see below), whose sum is σ = 444294900. Its totient is φ = 101553024.

The previous prime is 220031611. The next prime is 220031677. The reversal of 220031656 is 656130022.

220031656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 219336100 + 695556 = 14810^2 + 834^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 220031656.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1057741 + ... + 1057948.

Almost surely, 2^220031656 is an apocalyptic number.

220031656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

220031656 is an abundant number, since it is smaller than the sum of its proper divisors (224263244).

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

220031656 is a wasteful number, since it uses less digits than its factorization.

220031656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2115708 (or 2115704 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 220031656 is about 14833.4640593491. The cubic root of 220031656 is about 603.7100270306.

Adding to 220031656 its reverse (656130022), we get a palindrome (876161678).

It can be divided in two parts, 2200 and 31656, that added together give a square (33856 = 184²).

The spelling of 220031656 in words is "two hundred twenty million, thirty-one thousand, six hundred fifty-six".