20001020120 has 32 divisors (see below), whose sum is σ = 45008211600. Its totient is φ = 7999356288.

The previous prime is 20001020113. The next prime is 20001020147. The reversal of 20001020120 is 2102010002.

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 = 20001020098 and 20001020107.

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, 322682 + ... + 379638.

Almost surely, 2^20001020120 is an apocalyptic number.

20001020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001020120 is an abundant number, since it is smaller than the sum of its proper divisors (25007191480).

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

20001020120 is a wasteful number, since it uses less digits than its factorization.

20001020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65747 (or 65743 counting only the distinct ones).

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

Adding to 20001020120 its reverse (2102010002), we get a palindrome (22103030122).

The spelling of 20001020120 in words is "twenty billion, one million, twenty thousand, one hundred twenty".