20636530 has 16 divisors (see below), whose sum is σ = 38052504. Its totient is φ = 8053120.

The previous prime is 20636513. The next prime is 20636549. The reversal of 20636530 is 3563602.

It can be written as a sum of positive squares in 4 ways, for example, as 14220441 + 6416089 = 3771^2 + 2533^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20636495 and 20636504.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24757 + ... + 25576.

Almost surely, 2^20636530 is an apocalyptic number.

20636530 is a deficient number, since it is larger than the sum of its proper divisors (17415974).

20636530 is a wasteful number, since it uses less digits than its factorization.

20636530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50381.

The product of its (nonzero) digits is 3240, while the sum is 25.

The square root of 20636530 is about 4542.7447650072. The cubic root of 20636530 is about 274.2914209864.

The spelling of 20636530 in words is "twenty million, six hundred thirty-six thousand, five hundred thirty".