20890080 has 144 divisors (see below), whose sum is σ = 72530640. Its totient is φ = 5474304.

The previous prime is 20890061. The next prime is 20890099. The reversal of 20890080 is 8009802.

It is an interprime number because it is at equal distance from previous prime (20890061) and next prime (20890099).

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128079 + ... + 128241.

It is an arithmetic number, because the mean of its divisors is an integer number (503685).

Almost surely, 2^20890080 is an apocalyptic number.

20890080 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 20890080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36265320).

20890080 is an abundant number, since it is smaller than the sum of its proper divisors (51640560).

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

20890080 is a wasteful number, since it uses less digits than its factorization.

20890080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 20890080 is about 4570.5667044689. The cubic root of 20890080 is about 275.4102087371.

Adding to 20890080 its reverse (8009802), we get a palindrome (28899882).

The spelling of 20890080 in words is "twenty million, eight hundred ninety thousand, eighty".