20889180 has 144 divisors (see below), whose sum is σ = 69713280. Its totient is φ = 5031936.

The previous prime is 20889179. The next prime is 20889199. The reversal of 20889180 is 8198802.

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 47 ways as a sum of consecutive naturals, for example, 184804 + ... + 184916.

It is an arithmetic number, because the mean of its divisors is an integer number (484120).

Almost surely, 2^20889180 is an apocalyptic number.

20889180 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 20889180, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34856640).

20889180 is an abundant number, since it is smaller than the sum of its proper divisors (48824100).

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

20889180 is a wasteful number, since it uses less digits than its factorization.

20889180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 215 counting only the distinct ones).

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

The square root of 20889180 is about 4570.4682473462. The cubic root of 20889180 is about 275.4062535464.

The spelling of 20889180 in words is "twenty million, eight hundred eighty-nine thousand, one hundred eighty".