220423440 has 40 divisors (see below), whose sum is σ = 683313408. Its totient is φ = 58779520.

The previous prime is 220423387. The next prime is 220423451. The reversal of 220423440 is 44324022.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 458976 + ... + 459455.

Almost surely, 2^220423440 is an apocalyptic number.

220423440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220423440 is an abundant number, since it is smaller than the sum of its proper divisors (462889968).

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

220423440 is a wasteful number, since it uses less digits than its factorization.

220423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918447 (or 918441 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 220423440 is about 14846.6642718154. The cubic root of 220423440 is about 604.0681326004.

Adding to 220423440 its reverse (44324022), we get a palindrome (264747462).

It can be divided in two parts, 220 and 423440, that added together give a triangular number (423660 = T₉₂₀).

The spelling of 220423440 in words is "two hundred twenty million, four hundred twenty-three thousand, four hundred forty".