220400440 has 32 divisors (see below), whose sum is σ = 534048480. Its totient is φ = 81378432.

The previous prime is 220400431. The next prime is 220400471. The reversal of 220400440 is 44004022.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211404 + ... + 212443.

It is an arithmetic number, because the mean of its divisors is an integer number (16689015).

Almost surely, 2^220400440 is an apocalyptic number.

220400440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220400440 is an abundant number, since it is smaller than the sum of its proper divisors (313648040).

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

220400440 is a wasteful number, since it uses less digits than its factorization.

220400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423871 (or 423867 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 220400440 is about 14845.8896668404. The cubic root of 220400440 is about 604.0471214498.

Adding to 220400440 its reverse (44004022), we get a palindrome (264404462).

The spelling of 220400440 in words is "two hundred twenty million, four hundred thousand, four hundred forty".