2100020220 has 72 divisors (see below), whose sum is σ = 6705338640. Its totient is φ = 530530560.

The previous prime is 2100020189. The next prime is 2100020227. The reversal of 2100020220 is 220200012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100020227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 303601 + ... + 310440.

Almost surely, 2^2100020220 is an apocalyptic number.

2100020220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2100020220 is an abundant number, since it is smaller than the sum of its proper divisors (4605318420).

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

2100020220 is a wasteful number, since it uses less digits than its factorization.

2100020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614075 (or 614070 counting only the distinct ones).

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

The square root of 2100020220 is about 45825.9775673144. The cubic root of 2100020220 is about 1280.5832750236.

Adding to 2100020220 its reverse (220200012), we get a palindrome (2320220232).

The spelling of 2100020220 in words is "two billion, one hundred million, twenty thousand, two hundred twenty".