220641456 has 40 divisors (see below), whose sum is σ = 651418624. Its totient is φ = 63040320.

The previous prime is 220641451. The next prime is 220641457. The reversal of 220641456 is 654146022.

It is not an unprimeable number, because it can be changed into a prime (220641451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328000 + ... + 328671.

Almost surely, 2^220641456 is an apocalyptic number.

It is an amenable number.

220641456 is an abundant number, since it is smaller than the sum of its proper divisors (430777168).

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

220641456 is a wasteful number, since it uses less digits than its factorization.

220641456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656689 (or 656683 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 220641456 is about 14854.0047125346. The cubic root of 220641456 is about 604.2672238321.

Adding to 220641456 its reverse (654146022), we get a palindrome (874787478).

The spelling of 220641456 in words is "two hundred twenty million, six hundred forty-one thousand, four hundred fifty-six".