20455080 has 128 divisors (see below), whose sum is σ = 66977280. Its totient is φ = 4976640.

The previous prime is 20455051. The next prime is 20455081. The reversal of 20455080 is 8055402.

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 20455080.

It is not an unprimeable number, because it can be changed into a prime (20455081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75345 + ... + 75615.

It is an arithmetic number, because the mean of its divisors is an integer number (523260).

Almost surely, 2^20455080 is an apocalyptic number.

20455080 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 20455080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33488640).

20455080 is an abundant number, since it is smaller than the sum of its proper divisors (46522200).

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

20455080 is a wasteful number, since it uses less digits than its factorization.

20455080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339 (or 335 counting only the distinct ones).

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

The square root of 20455080 is about 4522.7292645039. The cubic root of 20455080 is about 273.4851361143.

The spelling of 20455080 in words is "twenty million, four hundred fifty-five thousand, eighty".