220897631 has 8 divisors (see below), whose sum is σ = 222228864. Its totient is φ = 219570840.

The previous prime is 220897601. The next prime is 220897637. The reversal of 220897631 is 136798022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220897631 is a prime.

It is a super-2 number, since 2×220897631² = 97591526762824322, 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 (220897637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160910 + ... + 162276.

It is an arithmetic number, because the mean of its divisors is an integer number (27778608).

Almost surely, 2^220897631 is an apocalyptic number.

220897631 is a deficient number, since it is larger than the sum of its proper divisors (1331233).

220897631 is a wasteful number, since it uses less digits than its factorization.

220897631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 220897631 is about 14862.6253064524. The cubic root of 220897631 is about 604.5009941733.

The spelling of 220897631 in words is "two hundred twenty million, eight hundred ninety-seven thousand, six hundred thirty-one".