20365573 has 2 divisors, whose sum is σ = 20365574. Its totient is φ = 20365572.

The previous prime is 20365567. The next prime is 20365589. The reversal of 20365573 is 37556302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13300609 + 7064964 = 3647^2 + 2658^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20365573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20365973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182786 + 10182787.

It is an arithmetic number, because the mean of its divisors is an integer number (10182787).

Almost surely, 2^20365573 is an apocalyptic number.

It is an amenable number.

20365573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20365573 is an equidigital number, since it uses as much as digits as its factorization.

20365573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 31.

The square root of 20365573 is about 4512.8231740231. The cubic root of 20365573 is about 273.0856489483.

The spelling of 20365573 in words is "twenty million, three hundred sixty-five thousand, five hundred seventy-three".