220972917 has 32 divisors (see below), whose sum is σ = 332763264. Its totient is φ = 129254400.

The previous prime is 220972859. The next prime is 220972931. The reversal of 220972917 is 719279022.

It is not a de Polignac number, because 220972917 - 2⁶ = 220972853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220972957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166617 + ... + 167937.

It is an arithmetic number, because the mean of its divisors is an integer number (10398852).

Almost surely, 2^220972917 is an apocalyptic number.

It is an amenable number.

220972917 is a deficient number, since it is larger than the sum of its proper divisors (111790347).

220972917 is a wasteful number, since it uses less digits than its factorization.

220972917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 220972917 is about 14865.1578195457. The cubic root of 220972917 is about 604.5696614143.

The spelling of 220972917 in words is "two hundred twenty million, nine hundred seventy-two thousand, nine hundred seventeen".