2220181020 has 72 divisors (see below), whose sum is σ = 6756653904. Its totient is φ = 590105088.

The previous prime is 2220181013. The next prime is 2220181049. The reversal of 2220181020 is 201810222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2220180984 and 2220181002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35172 + ... + 75348.

Almost surely, 2^2220181020 is an apocalyptic number.

2220181020 is a gapful number since it is divisible by the number (20) 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 2220181020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3378326952).

2220181020 is an abundant number, since it is smaller than the sum of its proper divisors (4536472884).

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

2220181020 is a wasteful number, since it uses less digits than its factorization.

2220181020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40499 (or 40494 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 2220181020 is about 47118.7968861685. The cubic root of 2220181020 is about 1304.5562061658.

Adding to 2220181020 its reverse (201810222), we get a palindrome (2421991242).

It can be divided in two parts, 2 and 220181020, that added together give a palindrome (220181022).

The spelling of 2220181020 in words is "two billion, two hundred twenty million, one hundred eighty-one thousand, twenty".