20889642 has 16 divisors (see below), whose sum is σ = 42057792. Its totient is φ = 6916800.

The previous prime is 20889613. The next prime is 20889643. The reversal of 20889642 is 24698802.

It is a self number, because there is not a number n which added to its sum of digits gives 20889642.

It is not an unprimeable number, because it can be changed into a prime (20889643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10623 + ... + 12434.

It is an arithmetic number, because the mean of its divisors is an integer number (2628612).

Almost surely, 2^20889642 is an apocalyptic number.

20889642 is an abundant number, since it is smaller than the sum of its proper divisors (21168150).

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

20889642 is a wasteful number, since it uses less digits than its factorization.

20889642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23213.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 20889642 is about 4570.5187889341. The cubic root of 20889642 is about 275.4082838918.

The spelling of 20889642 in words is "twenty million, eight hundred eighty-nine thousand, six hundred forty-two".