20493773 has 2 divisors, whose sum is σ = 20493774. Its totient is φ = 20493772.

The previous prime is 20493731. The next prime is 20493791. The reversal of 20493773 is 37739402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12124324 + 8369449 = 3482^2 + 2893^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20493773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20493073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10246886 + 10246887.

It is an arithmetic number, because the mean of its divisors is an integer number (10246887).

Almost surely, 2^20493773 is an apocalyptic number.

It is an amenable number.

20493773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20493773 is an equidigital number, since it uses as much as digits as its factorization.

20493773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 20493773 is about 4527.0048597279. The cubic root of 20493773 is about 273.6574697525.

The spelling of 20493773 in words is "twenty million, four hundred ninety-three thousand, seven hundred seventy-three".