20055840 has 192 divisors, whose sum is σ = 74317824. Its totient is φ = 4451328.

The previous prime is 20055829. The next prime is 20055857. The reversal of 20055840 is 4855002.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 20055840.

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, 157857 + ... + 157983.

It is an arithmetic number, because the mean of its divisors is an integer number (387072).

Almost surely, 2^20055840 is an apocalyptic number.

20055840 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 20055840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37158912).

20055840 is an abundant number, since it is smaller than the sum of its proper divisors (54261984).

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

20055840 is a wasteful number, since it uses less digits than its factorization.

20055840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 20055840 is about 4478.3747051804. The cubic root of 20055840 is about 271.6941487163.

The spelling of 20055840 in words is "twenty million, fifty-five thousand, eight hundred forty".