220581020 has 48 divisors (see below), whose sum is σ = 506411136. Its totient is φ = 80040000.

The previous prime is 220581019. The next prime is 220581029. The reversal of 220581020 is 20185022.

220581020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 220580983 and 220581001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220581029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 151295 + ... + 152745.

It is an arithmetic number, because the mean of its divisors is an integer number (10550232).

Almost surely, 2^220581020 is an apocalyptic number.

220581020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220581020 is an abundant number, since it is smaller than the sum of its proper divisors (285830116).

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

220581020 is a wasteful number, since it uses less digits than its factorization.

220581020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162 (or 2160 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 220581020 is about 14851.9702396685. The cubic root of 220581020 is about 604.2120470920.

The spelling of 220581020 in words is "two hundred twenty million, five hundred eighty-one thousand, twenty".