20202120100 has 18 divisors (see below), whose sum is σ = 43838600834. Its totient is φ = 8080848000.

The previous prime is 20202120089. The next prime is 20202120137. The reversal of 20202120100 is 102120202.

It can be written as a sum of positive squares in 3 ways, for example, as 6411845476 + 13790274624 = 80074^2 + 117432^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101010501 + ... + 101010700.

Almost surely, 2^20202120100 is an apocalyptic number.

20202120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20202120100 is an abundant number, since it is smaller than the sum of its proper divisors (23636480734).

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

20202120100 is a wasteful number, since it uses less digits than its factorization.

20202120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202021215 (or 202021208 counting only the distinct ones).

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

Adding to 20202120100 its reverse (102120202), we get a palindrome (20304240302).

The spelling of 20202120100 in words is "twenty billion, two hundred two million, one hundred twenty thousand, one hundred".