220531470 has 64 divisors (see below), whose sum is σ = 552661056. Its totient is φ = 56263680.

The previous prime is 220531469. The next prime is 220531483. The reversal of 220531470 is 74135022.

It is a self number, because there is not a number n which added to its sum of digits gives 220531470.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66082 + ... + 69338.

It is an arithmetic number, because the mean of its divisors is an integer number (8635329).

Almost surely, 2^220531470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220531470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276330528).

220531470 is an abundant number, since it is smaller than the sum of its proper divisors (332129586).

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

220531470 is a wasteful number, since it uses less digits than its factorization.

220531470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 220531470 is about 14850.3020171308. The cubic root of 220531470 is about 604.1668015114.

Adding to 220531470 its reverse (74135022), we get a palindrome (294666492).

The spelling of 220531470 in words is "two hundred twenty million, five hundred thirty-one thousand, four hundred seventy".