220631656 has 16 divisors (see below), whose sum is σ = 472782240. Its totient is φ = 94556400.

The previous prime is 220631647. The next prime is 220631657. The reversal of 220631656 is 656136022.

It is not an unprimeable number, because it can be changed into a prime (220631657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969870 + ... + 1969981.

It is an arithmetic number, because the mean of its divisors is an integer number (29548890).

Almost surely, 2^220631656 is an apocalyptic number.

It is an amenable number.

220631656 is an abundant number, since it is smaller than the sum of its proper divisors (252150584).

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

220631656 is a wasteful number, since it uses less digits than its factorization.

220631656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939864 (or 3939860 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 220631656 is about 14853.6748315021. The cubic root of 220631656 is about 604.2582773319.

Adding to 220631656 its reverse (656136022), we get a palindrome (876767678).

The spelling of 220631656 in words is "two hundred twenty million, six hundred thirty-one thousand, six hundred fifty-six".