20001012120 has 96 divisors (see below), whose sum is σ = 65225487600. Its totient is φ = 5315371776.

The previous prime is 20001012113. The next prime is 20001012133. The reversal of 20001012120 is 2121010002.

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

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, 10671 + ... + 200289.

Almost surely, 2^20001012120 is an apocalyptic number.

20001012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001012120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32612743800).

20001012120 is an abundant number, since it is smaller than the sum of its proper divisors (45224475480).

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

20001012120 is a wasteful number, since it uses less digits than its factorization.

20001012120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189929 (or 189922 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20001012120 its reverse (2121010002), we get a palindrome (22122022122).

The spelling of 20001012120 in words is "twenty billion, one million, twelve thousand, one hundred twenty".