205630636 has 6 divisors (see below), whose sum is σ = 359853620. Its totient is φ = 102815316.

The previous prime is 205630631. The next prime is 205630637. The reversal of 205630636 is 636036502.

It is a junction number, because it is equal to n+sod(n) for n = 205630598 and 205630607.

It is not an unprimeable number, because it can be changed into a prime (205630631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25703826 + ... + 25703833.

Almost surely, 2^205630636 is an apocalyptic number.

It is an amenable number.

205630636 is a deficient number, since it is larger than the sum of its proper divisors (154222984).

205630636 is a wasteful number, since it uses less digits than its factorization.

205630636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51407663 (or 51407661 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 31.

The square root of 205630636 is about 14339.8269166681. The cubic root of 205630636 is about 590.2408630656.

The spelling of 205630636 in words is "two hundred five million, six hundred thirty thousand, six hundred thirty-six".