220997856 has 48 divisors (see below), whose sum is σ = 581212800. Its totient is φ = 73527168.

The previous prime is 220997837. The next prime is 220997857. The reversal of 220997856 is 658799022.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220997857) by changing a digit.

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, 57565 + ... + 61283.

It is an arithmetic number, because the mean of its divisors is an integer number (12108600).

Almost surely, 2^220997856 is an apocalyptic number.

It is an amenable number.

220997856 is an abundant number, since it is smaller than the sum of its proper divisors (360214944).

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

220997856 is a wasteful number, since it uses less digits than its factorization.

220997856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4351 (or 4343 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 220997856 is about 14865.9966366201. The cubic root of 220997856 is about 604.5924044663.

The spelling of 220997856 in words is "two hundred twenty million, nine hundred ninety-seven thousand, eight hundred fifty-six".