21889080 has 96 divisors (see below), whose sum is σ = 72923760. Its totient is φ = 5690880.

The previous prime is 21889079. The next prime is 21889093. The reversal of 21889080 is 8098812.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 14019 + ... + 15501.

Almost surely, 2^21889080 is an apocalyptic number.

21889080 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 21889080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36461880).

21889080 is an abundant number, since it is smaller than the sum of its proper divisors (51034680).

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

21889080 is a wasteful number, since it uses less digits than its factorization.

21889080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541 (or 1534 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 21889080 is about 4678.5767066491. The cubic root of 21889080 is about 279.7322269949.

It can be divided in two parts, 218 and 89080, that added together give a palindrome (89298).

The spelling of 21889080 in words is "twenty-one million, eight hundred eighty-nine thousand, eighty".