20636516 has 24 divisors (see below), whose sum is σ = 37886520. Its totient is φ = 9821952.

The previous prime is 20636513. The next prime is 20636549. The reversal of 20636516 is 61563602.

It can be written as a sum of positive squares in 4 ways, for example, as 8761600 + 11874916 = 2960^2 + 3446^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

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 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, 7250 + ... + 9686.

It is an arithmetic number, because the mean of its divisors is an integer number (1578605).

Almost surely, 2^20636516 is an apocalyptic number.

It is an amenable number.

20636516 is a deficient number, since it is larger than the sum of its proper divisors (17250004).

20636516 is a wasteful number, since it uses less digits than its factorization.

20636516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543 (or 2541 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20636516 is about 4542.7432240883. The cubic root of 20636516 is about 274.2913589591.

The spelling of 20636516 in words is "twenty million, six hundred thirty-six thousand, five hundred sixteen".