220398681 has 4 divisors (see below), whose sum is σ = 293864912. Its totient is φ = 146932452.

The previous prime is 220398671. The next prime is 220398691. The reversal of 220398681 is 186893022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (220398671) and next prime (220398691).

It is not a de Polignac number, because 220398681 - 2⁷ = 220398553 is a prime.

It is a super-2 number, since 2×220398681² = 97151157173079522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220398611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36733111 + ... + 36733116.

It is an arithmetic number, because the mean of its divisors is an integer number (73466228).

Almost surely, 2^220398681 is an apocalyptic number.

It is an amenable number.

220398681 is a deficient number, since it is larger than the sum of its proper divisors (73466231).

220398681 is an equidigital number, since it uses as much as digits as its factorization.

220398681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73466230.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 220398681 is about 14845.8304247354. The cubic root of 220398681 is about 604.0455144934.

The spelling of 220398681 in words is "two hundred twenty million, three hundred ninety-eight thousand, six hundred eighty-one".