2220001020 has 120 divisors (see below), whose sum is σ = 7062679008. Its totient is φ = 583632000.

The previous prime is 2220001013. The next prime is 2220001031. The reversal of 2220001020 is 201000222.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2220000993 and 2220001011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 105370 + ... + 124670.

Almost surely, 2^2220001020 is an apocalyptic number.

2220001020 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 2220001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3531339504).

2220001020 is an abundant number, since it is smaller than the sum of its proper divisors (4842677988).

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

2220001020 is a wasteful number, since it uses less digits than its factorization.

2220001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19393 (or 19382 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2220001020 is about 47116.8867817049. The cubic root of 2220001020 is about 1304.5209498119.

Adding to 2220001020 its reverse (201000222), we get a palindrome (2421001242).

The spelling of 2220001020 in words is "two billion, two hundred twenty million, one thousand, twenty".