220031240 has 144 divisors (see below), whose sum is σ = 591437700. Its totient is φ = 73582080.

The previous prime is 220031239. The next prime is 220031243. The reversal of 220031240 is 42130022.

It can be written as a sum of positive squares in 6 ways, for example, as 813604 + 219217636 = 902^2 + 14806^2 .

It is not an unprimeable number, because it can be changed into a prime (220031243) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 817826 + ... + 818094.

Almost surely, 2^220031240 is an apocalyptic number.

220031240 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 220031240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295718850).

220031240 is an abundant number, since it is smaller than the sum of its proper divisors (371406460).

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

220031240 is a wasteful number, since it uses less digits than its factorization.

220031240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328 (or 300 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 220031240 is about 14833.4500369941. The cubic root of 220031240 is about 603.7096465648.

Adding to 220031240 its reverse (42130022), we get a palindrome (262161262).

The spelling of 220031240 in words is "two hundred twenty million, thirty-one thousand, two hundred forty".