220561100 has 18 divisors (see below), whose sum is σ = 478617804. Its totient is φ = 88224400.

The previous prime is 220561093. The next prime is 220561109. The reversal of 220561100 is 1165022.

It is not an unprimeable number, because it can be changed into a prime (220561109) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1102706 + ... + 1102905.

It is an arithmetic number, because the mean of its divisors is an integer number (26589878).

Almost surely, 2^220561100 is an apocalyptic number.

220561100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220561100 is an abundant number, since it is smaller than the sum of its proper divisors (258056704).

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

220561100 is a wasteful number, since it uses less digits than its factorization.

220561100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205625 (or 2205618 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 220561100 is about 14851.2996064318. The cubic root of 220561100 is about 604.1938583613.

The spelling of 220561100 in words is "two hundred twenty million, five hundred sixty-one thousand, one hundred".