20001332120 has 128 divisors (see below), whose sum is σ = 56199951360. Its totient is φ = 6223925760.

The previous prime is 20001332089. The next prime is 20001332179. The reversal of 20001332120 is 2123310002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20001332095 and 20001332104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1987742 + ... + 1997778.

It is an arithmetic number, because the mean of its divisors is an integer number (439062120).

Almost surely, 2^20001332120 is an apocalyptic number.

20001332120 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 20001332120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28099975680).

20001332120 is an abundant number, since it is smaller than the sum of its proper divisors (36198619240).

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

20001332120 is a wasteful number, since it uses less digits than its factorization.

20001332120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10713 (or 10709 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20001332120 its reverse (2123310002), we get a palindrome (22124642122).

The spelling of 20001332120 in words is "twenty billion, one million, three hundred thirty-two thousand, one hundred twenty".