20889888 has 48 divisors (see below), whose sum is σ = 57226176. Its totient is φ = 6659840.

The previous prime is 20889881. The next prime is 20889901. The reversal of 20889888 is 88898802.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 20889888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20889881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2523 + ... + 6938.

It is an arithmetic number, because the mean of its divisors is an integer number (1192212).

Almost surely, 2^20889888 is an apocalyptic number.

It is an amenable number.

20889888 is an abundant number, since it is smaller than the sum of its proper divisors (36336288).

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

20889888 is a wasteful number, since it uses less digits than its factorization.

20889888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9497 (or 9489 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 51.

The square root of 20889888 is about 4570.5457004607. The cubic root of 20889888 is about 275.4093649726.

The spelling of 20889888 in words is "twenty million, eight hundred eighty-nine thousand, eight hundred eighty-eight".