20755280 has 80 divisors (see below), whose sum is σ = 59412864. Its totient is φ = 6566400.

The previous prime is 20755211. The next prime is 20755297. The reversal of 20755280 is 8255702.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5855 + ... + 8705.

Almost surely, 2^20755280 is an apocalyptic number.

20755280 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 20755280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29706432).

20755280 is an abundant number, since it is smaller than the sum of its proper divisors (38657584).

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

20755280 is a wasteful number, since it uses less digits than its factorization.

20755280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2884 (or 2878 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 20755280 is about 4555.7963080015. The cubic root of 20755280 is about 274.8165387915.

The spelling of 20755280 in words is "twenty million, seven hundred fifty-five thousand, two hundred eighty".