20001002120 has 64 divisors (see below), whose sum is σ = 50290813440. Its totient is φ = 7095692800.

The previous prime is 20001002059. The next prime is 20001002143. The reversal of 20001002120 is 2120010002.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 20001002098 and 20001002107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 536312 + ... + 572391.

It is an arithmetic number, because the mean of its divisors is an integer number (785793960).

Almost surely, 2^20001002120 is an apocalyptic number.

20001002120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001002120 is an abundant number, since it is smaller than the sum of its proper divisors (30289811320).

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

20001002120 is a wasteful number, since it uses less digits than its factorization.

20001002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108766 (or 1108762 counting only the distinct ones).

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

Adding to 20001002120 its reverse (2120010002), we get a palindrome (22121012122).

The spelling of 20001002120 in words is "twenty billion, one million, two thousand, one hundred twenty".