220857912 has 144 divisors (see below), whose sum is σ = 666633240. Its totient is φ = 66000000.

The previous prime is 220857911. The next prime is 220857977. The reversal of 220857912 is 219758022.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220857911) 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 35 ways as a sum of consecutive naturals, for example, 879787 + ... + 880037.

Almost surely, 2^220857912 is an apocalyptic number.

220857912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220857912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (333316620).

220857912 is an abundant number, since it is smaller than the sum of its proper divisors (445775328).

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

220857912 is a wasteful number, since it uses less digits than its factorization.

220857912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 368 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 220857912 is about 14861.2890423408. The cubic root of 220857912 is about 604.4647607771.

The spelling of 220857912 in words is "two hundred twenty million, eight hundred fifty-seven thousand, nine hundred twelve".