220553645 has 16 divisors (see below), whose sum is σ = 286516272. Its totient is φ = 162017280.

The previous prime is 220553629. The next prime is 220553687. The reversal of 220553645 is 546355022.

220553645 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 56355049 + 164198596 = 7507^2 + 12814^2 .

It is not a de Polignac number, because 220553645 - 2⁴ = 220553629 is a prime.

It is a super-3 number, since 3×220553645³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

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, 3755 + ... + 21335.

It is an arithmetic number, because the mean of its divisors is an integer number (17907267).

Almost surely, 2^220553645 is an apocalyptic number.

It is an amenable number.

220553645 is a deficient number, since it is larger than the sum of its proper divisors (65962627).

220553645 is a wasteful number, since it uses less digits than its factorization.

220553645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17792.

The product of its (nonzero) digits is 36000, while the sum is 32.

The square root of 220553645 is about 14851.0486161752. The cubic root of 220553645 is about 604.1870510020.

The spelling of 220553645 in words is "two hundred twenty million, five hundred fifty-three thousand, six hundred forty-five".