220402161 has 32 divisors (see below), whose sum is σ = 395124480. Its totient is φ = 118533888.

The previous prime is 220402151. The next prime is 220402177. The reversal of 220402161 is 161204022.

It is not a de Polignac number, because 220402161 - 2⁶ = 220402097 is a prime.

It is a super-2 number, since 2×220402161² = 97154225146939842, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (220402121) 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 31 ways as a sum of consecutive naturals, for example, 31086 + ... + 37511.

It is an arithmetic number, because the mean of its divisors is an integer number (12347640).

Almost surely, 2^220402161 is an apocalyptic number.

220402161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

220402161 is a deficient number, since it is larger than the sum of its proper divisors (174722319).

220402161 is a wasteful number, since it uses less digits than its factorization.

220402161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68630 (or 68624 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 220402161 is about 14845.9476288986. The cubic root of 220402161 is about 604.0486936826.

Adding to 220402161 its reverse (161204022), we get a palindrome (381606183).

The spelling of 220402161 in words is "two hundred twenty million, four hundred two thousand, one hundred sixty-one".