20306786 has 12 divisors (see below), whose sum is σ = 31549362. Its totient is φ = 9802464.

The previous prime is 20306779. The next prime is 20306807. The reversal of 20306786 is 68760302.

It can be written as a sum of positive squares in 3 ways, for example, as 12075625 + 8231161 = 3475^2 + 2869^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4355 + ... + 7718.

Almost surely, 2^20306786 is an apocalyptic number.

20306786 is a deficient number, since it is larger than the sum of its proper divisors (11242576).

20306786 is a wasteful number, since it uses less digits than its factorization.

20306786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12133 (or 12104 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 20306786 is about 4506.3051383589. The cubic root of 20306786 is about 272.8226338780.

The spelling of 20306786 in words is "twenty million, three hundred six thousand, seven hundred eighty-six".