220643634 has 16 divisors (see below), whose sum is σ = 443754720. Its totient is φ = 73136640.

The previous prime is 220643627. The next prime is 220643651. The reversal of 220643634 is 436346022.

It is a happy number.

It is a super-2 number, since 2×220643634² = 97367226449451912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101647 + ... + 103794.

It is an arithmetic number, because the mean of its divisors is an integer number (27734670).

Almost surely, 2^220643634 is an apocalyptic number.

220643634 is an abundant number, since it is smaller than the sum of its proper divisors (223111086).

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

220643634 is a wasteful number, since it uses less digits than its factorization.

220643634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205625.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 220643634 is about 14854.0780259160. The cubic root of 220643634 is about 604.2692121101.

Adding to 220643634 its reverse (436346022), we get a palindrome (656989656).

The spelling of 220643634 in words is "two hundred twenty million, six hundred forty-three thousand, six hundred thirty-four".