20445632 has 28 divisors (see below), whose sum is σ = 40986456. Its totient is φ = 10118400.

The previous prime is 20445629. The next prime is 20445637. The reversal of 20445632 is 23654402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20445637) 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, 4883 + ... + 8045.

It is an arithmetic number, because the mean of its divisors is an integer number (1463802).

Almost surely, 2^20445632 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 20445632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20493228).

20445632 is an abundant number, since it is smaller than the sum of its proper divisors (20540824).

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

20445632 is a wasteful number, since it uses less digits than its factorization.

20445632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276 (or 3266 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 20445632 is about 4521.6846418122. The cubic root of 20445632 is about 273.4430229328.

The spelling of 20445632 in words is "twenty million, four hundred forty-five thousand, six hundred thirty-two".