20202100020 has 72 divisors (see below), whose sum is σ = 62142837120. Its totient is φ = 5311346880.

The previous prime is 20202100019. The next prime is 20202100063. The reversal of 20202100020 is 2000120202.

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 = 20202099975 and 20202100011.

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, 777600 + ... + 803159.

It is an arithmetic number, because the mean of its divisors is an integer number (863094960).

Almost surely, 2^20202100020 is an apocalyptic number.

20202100020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20202100020 is an abundant number, since it is smaller than the sum of its proper divisors (41940737100).

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

20202100020 is a wasteful number, since it uses less digits than its factorization.

20202100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580845 (or 1580840 counting only the distinct ones).

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

Adding to 20202100020 its reverse (2000120202), we get a palindrome (22202220222).

The spelling of 20202100020 in words is "twenty billion, two hundred two million, one hundred thousand, twenty".