20989232 has 40 divisors (see below), whose sum is σ = 45806592. Its totient is φ = 9230400.

The previous prime is 20989229. The next prime is 20989279. The reversal of 20989232 is 23298902.

It is a junction number, because it is equal to n+sod(n) for n = 20989192 and 20989201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3533 + ... + 7379.

Almost surely, 2^20989232 is an apocalyptic number.

20989232 is a gapful number since it is divisible by the number (22) 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 20989232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22903296).

20989232 is an abundant number, since it is smaller than the sum of its proper divisors (24817360).

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

20989232 is a wasteful number, since it uses less digits than its factorization.

20989232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3897 (or 3891 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 20989232 is about 4581.4006591871. The cubic root of 20989232 is about 275.8452538687.

The spelling of 20989232 in words is "twenty million, nine hundred eighty-nine thousand, two hundred thirty-two".