20102100220 has 48 divisors (see below), whose sum is σ = 43145303040. Its totient is φ = 7863787584.

The previous prime is 20102100199. The next prime is 20102100223. The reversal of 20102100220 is 2200120102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 20102100197 and 20102100206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102100223) 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, 1352791 + ... + 1367569.

It is an arithmetic number, because the mean of its divisors is an integer number (898860480).

Almost surely, 2^20102100220 is an apocalyptic number.

20102100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20102100220 is an abundant number, since it is smaller than the sum of its proper divisors (23043202820).

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

20102100220 is a wasteful number, since it uses less digits than its factorization.

20102100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16282 (or 16280 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20102100220 its reverse (2200120102), we get a palindrome (22302220322).

The spelling of 20102100220 in words is "twenty billion, one hundred two million, one hundred thousand, two hundred twenty".