220613857 has 4 divisors (see below), whose sum is σ = 220705540. Its totient is φ = 220522176.

The previous prime is 220613851. The next prime is 220613863. The reversal of 220613857 is 758316022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (220613851) and next prime (220613863).

It can be written as a sum of positive squares in 2 ways, for example, as 111703761 + 108910096 = 10569^2 + 10436^2 .

It is a cyclic number.

It is not a de Polignac number, because 220613857 - 2²⁷ = 86396129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220613851) 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 3 ways as a sum of consecutive naturals, for example, 42132 + ... + 47077.

It is an arithmetic number, because the mean of its divisors is an integer number (55176385).

Almost surely, 2^220613857 is an apocalyptic number.

It is an amenable number.

220613857 is a deficient number, since it is larger than the sum of its proper divisors (91683).

220613857 is an equidigital number, since it uses as much as digits as its factorization.

220613857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91682.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 220613857 is about 14853.0756747550. The cubic root of 220613857 is about 604.2420278017.

Adding to 220613857 its reverse (758316022), we get a palindrome (978929879).

The spelling of 220613857 in words is "two hundred twenty million, six hundred thirteen thousand, eight hundred fifty-seven".