20812712 has 16 divisors (see below), whose sum is σ = 39664500. Its totient is φ = 10235520.

The previous prime is 20812703. The next prime is 20812717. The reversal of 20812712 is 21721802.

It can be written as a sum of positive squares in 2 ways, for example, as 19589476 + 1223236 = 4426^2 + 1106^2 .

It is not an unprimeable number, because it can be changed into a prime (20812717) by changing a digit.

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, 20837 + ... + 21812.

Almost surely, 2^20812712 is an apocalyptic number.

It is an amenable number.

20812712 is a deficient number, since it is larger than the sum of its proper divisors (18851788).

20812712 is a wasteful number, since it uses less digits than its factorization.

20812712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42716 (or 42712 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 20812712 is about 4562.0951327214. The cubic root of 20812712 is about 275.0697872471.

The spelling of 20812712 in words is "twenty million, eight hundred twelve thousand, seven hundred twelve".