20565132 has 48 divisors (see below), whose sum is σ = 56017920. Its totient is φ = 5749632.

The previous prime is 20565109. The next prime is 20565133. The reversal of 20565132 is 23156502.

It is not an unprimeable number, because it can be changed into a prime (20565133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1344 + ... + 6552.

It is an arithmetic number, because the mean of its divisors is an integer number (1167040).

Almost surely, 2^20565132 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 20565132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28008960).

20565132 is an abundant number, since it is smaller than the sum of its proper divisors (35452788).

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

20565132 is a wasteful number, since it uses less digits than its factorization.

20565132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5270 (or 5268 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 20565132 is about 4534.8794912324. The cubic root of 20565132 is about 273.9747255000.

The spelling of 20565132 in words is "twenty million, five hundred sixty-five thousand, one hundred thirty-two".