20609232 has 80 divisors (see below), whose sum is σ = 61662720. Its totient is φ = 5809536.

The previous prime is 20609221. The next prime is 20609261. The reversal of 20609232 is 23290602.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 27519 + ... + 28257.

It is an arithmetic number, because the mean of its divisors is an integer number (770784).

Almost surely, 2^20609232 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 20609232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30831360).

20609232 is an abundant number, since it is smaller than the sum of its proper divisors (41053488).

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

20609232 is a wasteful number, since it uses less digits than its factorization.

20609232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 834 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 20609232 is about 4539.7391995576. The cubic root of 20609232 is about 274.1704233966.

Adding to 20609232 its reverse (23290602), we get a palindrome (43899834).

The spelling of 20609232 in words is "twenty million, six hundred nine thousand, two hundred thirty-two".