20989332 has 144 divisors (see below), whose sum is σ = 67267200. Its totient is φ = 5370624.

The previous prime is 20989321. The next prime is 20989333. The reversal of 20989332 is 23398902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20989333) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 140794 + ... + 140942.

Almost surely, 2^20989332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20989332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33633600).

20989332 is an abundant number, since it is smaller than the sum of its proper divisors (46277868).

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

20989332 is a wasteful number, since it uses less digits than its factorization.

20989332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 20989332 is about 4581.4115728670. The cubic root of 20989332 is about 275.8456919423.

It can be divided in two parts, 20989 and 332, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 20989332 in words is "twenty million, nine hundred eighty-nine thousand, three hundred thirty-two".