220286261 has 6 divisors (see below), whose sum is σ = 238535010. Its totient is φ = 203341008.

The previous prime is 220286251. The next prime is 220286267. The reversal of 220286261 is 162682022.

It can be written as a sum of positive squares in 3 ways, for example, as 13645636 + 206640625 = 3694^2 + 14375^2 .

It is a de Polignac number, because none of the positive numbers 2^k-220286261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220286267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 651566 + ... + 651903.

It is an arithmetic number, because the mean of its divisors is an integer number (39755835).

Almost surely, 2^220286261 is an apocalyptic number.

It is an amenable number.

220286261 is a deficient number, since it is larger than the sum of its proper divisors (18248749).

220286261 is a wasteful number, since it uses less digits than its factorization.

220286261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303495 (or 1303482 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 220286261 is about 14842.0436935080. The cubic root of 220286261 is about 603.9427940573.

The spelling of 220286261 in words is "two hundred twenty million, two hundred eighty-six thousand, two hundred sixty-one".