220746181 has 4 divisors (see below), whose sum is σ = 226712332. Its totient is φ = 214780032.

The previous prime is 220746179. The next prime is 220746187. The reversal of 220746181 is 181647022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181647022 = 2 ⋅90823511.

It can be written as a sum of positive squares in 2 ways, for example, as 102697956 + 118048225 = 10134^2 + 10865^2 .

It is a cyclic number.

It is not a de Polignac number, because 220746181 - 2¹ = 220746179 is a prime.

It is a super-2 number, since 2×220746181² = 97457752852169522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220746187) 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, 2983020 + ... + 2983093.

It is an arithmetic number, because the mean of its divisors is an integer number (56678083).

Almost surely, 2^220746181 is an apocalyptic number.

It is an amenable number.

220746181 is a deficient number, since it is larger than the sum of its proper divisors (5966151).

220746181 is an equidigital number, since it uses as much as digits as its factorization.

220746181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5966150.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 220746181 is about 14857.5294379651. The cubic root of 220746181 is about 604.3628116042.

The spelling of 220746181 in words is "two hundred twenty million, seven hundred forty-six thousand, one hundred eighty-one".