220820456 has 8 divisors (see below), whose sum is σ = 414038370. Its totient is φ = 110410224.

The previous prime is 220820449. The next prime is 220820459. The reversal of 220820456 is 654028022.

It can be written as a sum of positive squares in only one way, i.e., 162052900 + 58767556 = 12730^2 + 7666^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (220820459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13801271 + ... + 13801286.

Almost surely, 2^220820456 is an apocalyptic number.

It is an amenable number.

220820456 is a deficient number, since it is larger than the sum of its proper divisors (193217914).

220820456 is a wasteful number, since it uses less digits than its factorization.

220820456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27602563 (or 27602559 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 220820456 is about 14860.0288021255. The cubic root of 220820456 is about 604.4305878075.

Adding to 220820456 its reverse (654028022), we get a palindrome (874848478).

The spelling of 220820456 in words is "two hundred twenty million, eight hundred twenty thousand, four hundred fifty-six".