20989392 has 20 divisors (see below), whose sum is σ = 54222720. Its totient is φ = 6996448.

The previous prime is 20989391. The next prime is 20989393. The reversal of 20989392 is 29398902.

It is an interprime number because it is at equal distance from previous prime (20989391) and next prime (20989393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20989391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218592 + ... + 218687.

It is an arithmetic number, because the mean of its divisors is an integer number (2711136).

Almost surely, 2^20989392 is an apocalyptic number.

It is an amenable number.

20989392 is an abundant number, since it is smaller than the sum of its proper divisors (33233328).

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

20989392 is a wasteful number, since it uses less digits than its factorization.

20989392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437290 (or 437284 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 20989392 is about 4581.4181210625. The cubic root of 20989392 is about 275.8459547857.

The spelling of 20989392 in words is "twenty million, nine hundred eighty-nine thousand, three hundred ninety-two".