20909232 has 80 divisors (see below), whose sum is σ = 62124000. Its totient is φ = 6725376.

The previous prime is 20909209. The next prime is 20909281. The reversal of 20909232 is 23290902.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20909196 and 20909205.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11694 + ... + 13362.

It is an arithmetic number, because the mean of its divisors is an integer number (776550).

Almost surely, 2^20909232 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 20909232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31062000).

20909232 is an abundant number, since it is smaller than the sum of its proper divisors (41214768).

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

20909232 is a wasteful number, since it uses less digits than its factorization.

20909232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715 (or 1703 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20909232 is about 4572.6613694871. The cubic root of 20909232 is about 275.4943482777.

The spelling of 20909232 in words is "twenty million, nine hundred nine thousand, two hundred thirty-two".