20109642120 has 128 divisors (see below), whose sum is σ = 67113446400. Its totient is φ = 5356067328.

The previous prime is 20109642101. The next prime is 20109642131. The reversal of 20109642120 is 2124690102.

20109642120 is a `hidden beast` number, since 2 + 0 + 1 + 0 + 9 + 642 + 12 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 914697 + ... + 936423.

It is an arithmetic number, because the mean of its divisors is an integer number (524323800).

Almost surely, 2^20109642120 is an apocalyptic number.

20109642120 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 20109642120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33556723200).

20109642120 is an abundant number, since it is smaller than the sum of its proper divisors (47003804280).

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

20109642120 is a wasteful number, since it uses less digits than its factorization.

20109642120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22604 (or 22594 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 20109642120 in words is "twenty billion, one hundred nine million, six hundred forty-two thousand, one hundred twenty".