20746013 has 2 divisors, whose sum is σ = 20746014. Its totient is φ = 20746012.

The previous prime is 20746007. The next prime is 20746021. The reversal of 20746013 is 31064702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20313049 + 432964 = 4507^2 + 658^2 .

It is a cyclic number.

It is not a de Polignac number, because 20746013 - 2¹⁴ = 20729629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20746013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20746093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373006 + 10373007.

It is an arithmetic number, because the mean of its divisors is an integer number (10373007).

Almost surely, 2^20746013 is an apocalyptic number.

It is an amenable number.

20746013 is a deficient number, since it is larger than the sum of its proper divisors (1).

20746013 is an equidigital number, since it uses as much as digits as its factorization.

20746013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 20746013 is about 4554.7791384435. The cubic root of 20746013 is about 274.7756318674.

The spelling of 20746013 in words is "twenty million, seven hundred forty-six thousand, thirteen".