20636528 has 40 divisors (see below), whose sum is σ = 44811120. Its totient is φ = 9123840.

The previous prime is 20636513. The next prime is 20636549. The reversal of 20636528 is 82563602.

It is a junction number, because it is equal to n+sod(n) for n = 20636494 and 20636503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4928 + ... + 8096.

It is an arithmetic number, because the mean of its divisors is an integer number (1120278).

Almost surely, 2^20636528 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 20636528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22405560).

20636528 is an abundant number, since it is smaller than the sum of its proper divisors (24174592).

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

20636528 is a wasteful number, since it uses less digits than its factorization.

20636528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3225 (or 3219 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 20636528 is about 4542.7445448759. The cubic root of 20636528 is about 274.2914121254.

The spelling of 20636528 in words is "twenty million, six hundred thirty-six thousand, five hundred twenty-eight".