220120645 has 16 divisors (see below), whose sum is σ = 267951600. Its totient is φ = 173574144.

The previous prime is 220120639. The next prime is 220120657. The reversal of 220120645 is 546021022.

220120645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 2056356 + 218064289 = 1434^2 + 14767^2 .

It is a cyclic number.

It is not a de Polignac number, because 220120645 - 2⁷ = 220120517 is a prime.

It is a congruent number.

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, 141331 + ... + 142879.

It is an arithmetic number, because the mean of its divisors is an integer number (16746975).

Almost surely, 2^220120645 is an apocalyptic number.

It is an amenable number.

220120645 is a deficient number, since it is larger than the sum of its proper divisors (47830955).

220120645 is a wasteful number, since it uses less digits than its factorization.

220120645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 220120645 is about 14836.4633589006. The cubic root of 220120645 is about 603.7914036707.

Adding to 220120645 its reverse (546021022), we get a palindrome (766141667).

The spelling of 220120645 in words is "two hundred twenty million, one hundred twenty thousand, six hundred forty-five".