220238657 has 4 divisors (see below), whose sum is σ = 220336836. Its totient is φ = 220140480.

The previous prime is 220238651. The next prime is 220238659. The reversal of 220238657 is 756832022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756832022 = 2 ⋅378416011.

It can be written as a sum of positive squares in 2 ways, for example, as 174662656 + 45576001 = 13216^2 + 6751^2 .

It is a cyclic number.

It is not a de Polignac number, because 220238657 - 2⁸ = 220238401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220238651) 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, 45644 + ... + 50237.

It is an arithmetic number, because the mean of its divisors is an integer number (55084209).

Almost surely, 2^220238657 is an apocalyptic number.

It is an amenable number.

220238657 is a deficient number, since it is larger than the sum of its proper divisors (98179).

220238657 is an equidigital number, since it uses as much as digits as its factorization.

220238657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98178.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 220238657 is about 14840.4399193555. The cubic root of 220238657 is about 603.8992867835.

The spelling of 220238657 in words is "two hundred twenty million, two hundred thirty-eight thousand, six hundred fifty-seven".