20005555120 has 160 divisors (see below), whose sum is σ = 50419380096. Its totient is φ = 7354368000.

The previous prime is 20005555117. The next prime is 20005555133. The reversal of 20005555120 is 2155550002.

It is a happy 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, 12526162 + ... + 12527758.

Almost surely, 2^20005555120 is an apocalyptic number.

20005555120 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 20005555120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25209690048).

20005555120 is an abundant number, since it is smaller than the sum of its proper divisors (30413824976).

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

20005555120 is a wasteful number, since it uses less digits than its factorization.

20005555120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839 (or 1833 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 25.

The spelling of 20005555120 in words is "twenty billion, five million, five hundred fifty-five thousand, one hundred twenty".