20636512 has 48 divisors (see below), whose sum is σ = 44241120. Its totient is φ = 9418752.

The previous prime is 20636509. The next prime is 20636513. The reversal of 20636512 is 21563602.

It is a super-2 number, since 2×20636512² = 851731255052288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20636513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46789 + ... + 47227.

It is an arithmetic number, because the mean of its divisors is an integer number (921690).

Almost surely, 2^20636512 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 20636512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22120560).

20636512 is an abundant number, since it is smaller than the sum of its proper divisors (23604608).

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

20636512 is a wasteful number, since it uses less digits than its factorization.

20636512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575 (or 567 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20636512 is about 4542.7427838256. The cubic root of 20636512 is about 274.2913412371.

The spelling of 20636512 in words is "twenty million, six hundred thirty-six thousand, five hundred twelve".