20630756 has 12 divisors (see below), whose sum is σ = 37079868. Its totient is φ = 10036512.

The previous prime is 20630711. The next prime is 20630761. The reversal of 20630756 is 65703602.

It can be written as a sum of positive squares in 2 ways, for example, as 11833600 + 8797156 = 3440^2 + 2966^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 69551 + ... + 69846.

It is an arithmetic number, because the mean of its divisors is an integer number (3089989).

Almost surely, 2^20630756 is an apocalyptic number.

It is an amenable number.

20630756 is a deficient number, since it is larger than the sum of its proper divisors (16449112).

20630756 is a wasteful number, since it uses less digits than its factorization.

20630756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139438 (or 139436 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 20630756 is about 4542.1092016815. The cubic root of 20630756 is about 274.2658368015.

The spelling of 20630756 in words is "twenty million, six hundred thirty thousand, seven hundred fifty-six".