220731696 has 80 divisors (see below), whose sum is σ = 635361120. Its totient is φ = 73370880.

The previous prime is 220731661. The next prime is 220731727. The reversal of 220731696 is 696137022.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 220731696.

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, 285166 + ... + 285938.

It is an arithmetic number, because the mean of its divisors is an integer number (7942014).

Almost surely, 2^220731696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220731696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317680560).

220731696 is an abundant number, since it is smaller than the sum of its proper divisors (414629424).

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

220731696 is a wasteful number, since it uses less digits than its factorization.

220731696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1451 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 220731696 is about 14857.0419666904. The cubic root of 220731696 is about 604.3495922184.

The spelling of 220731696 in words is "two hundred twenty million, seven hundred thirty-one thousand, six hundred ninety-six".