220161240 has 160 divisors (see below), whose sum is σ = 797060880. Its totient is φ = 54183168.

The previous prime is 220161239. The next prime is 220161251. The reversal of 220161240 is 42161022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39507 + ... + 44733.

Almost surely, 2^220161240 is an apocalyptic number.

220161240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220161240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398530440).

220161240 is an abundant number, since it is smaller than the sum of its proper divisors (576899640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220161240 is a wasteful number, since it uses less digits than its factorization.

220161240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263 (or 5250 counting only the distinct ones).

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

The square root of 220161240 is about 14837.8313779339. The cubic root of 220161240 is about 603.8285187800.

The spelling of 220161240 in words is "two hundred twenty million, one hundred sixty-one thousand, two hundred forty".