20100000020 has 24 divisors (see below), whose sum is σ = 42744307200. Its totient is φ = 7938227232.

The previous prime is 20099999981. The next prime is 20100000047. The reversal of 20100000020 is 2000000102.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6359180 + ... + 6362339.

It is an arithmetic number, because the mean of its divisors is an integer number (1781012800).

Almost surely, 2^20100000020 is an apocalyptic number.

20100000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100000020 is an abundant number, since it is smaller than the sum of its proper divisors (22644307180).

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

20100000020 is a wasteful number, since it uses less digits than its factorization.

20100000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12721607 (or 12721605 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 5.

Adding to 20100000020 its reverse (2000000102), we get a palindrome (22100000122).

The spelling of 20100000020 in words is "twenty billion, one hundred million, twenty", and thus it is an aban number.