20618536 has 16 divisors (see below), whose sum is σ = 39993300. Its totient is φ = 9953664.

The previous prime is 20618527. The next prime is 20618539. The reversal of 20618536 is 63581602.

It can be written as a sum of positive squares in 2 ways, for example, as 20196036 + 422500 = 4494^2 + 650^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20618498 and 20618507.

It is not an unprimeable number, because it can be changed into a prime (20618539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44205 + ... + 44668.

Almost surely, 2^20618536 is an apocalyptic number.

It is an amenable number.

20618536 is a deficient number, since it is larger than the sum of its proper divisors (19374764).

20618536 is a wasteful number, since it uses less digits than its factorization.

20618536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88908 (or 88904 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20618536 is about 4540.7638123998. The cubic root of 20618536 is about 274.2116751012.

The spelling of 20618536 in words is "twenty million, six hundred eighteen thousand, five hundred thirty-six".