220861900 has 36 divisors (see below), whose sum is σ = 547739248. Its totient is φ = 75723840.

The previous prime is 220861897. The next prime is 220861933. The reversal of 220861900 is 9168022.

It is a happy number.

It is a super-2 number, since 2×220861900² = 97559957743220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 157059 + ... + 158458.

Almost surely, 2^220861900 is an apocalyptic number.

220861900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220861900 is an abundant number, since it is smaller than the sum of its proper divisors (326877348).

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

220861900 is a wasteful number, since it uses less digits than its factorization.

220861900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315538 (or 315531 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 220861900 is about 14861.4232158296. The cubic root of 220861900 is about 604.4683990000.

The spelling of 220861900 in words is "two hundred twenty million, eight hundred sixty-one thousand, nine hundred".