20748773 has 2 divisors, whose sum is σ = 20748774. Its totient is φ = 20748772.

The previous prime is 20748769. The next prime is 20748803. The reversal of 20748773 is 37784702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14760964 + 5987809 = 3842^2 + 2447^2 .

It is a cyclic number.

It is not a de Polignac number, because 20748773 - 2² = 20748769 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20748713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10374386 + 10374387.

It is an arithmetic number, because the mean of its divisors is an integer number (10374387).

Almost surely, 2^20748773 is an apocalyptic number.

It is an amenable number.

20748773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20748773 is an equidigital number, since it uses as much as digits as its factorization.

20748773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 20748773 is about 4555.0821068341. The cubic root of 20748773 is about 274.7878164916.

The spelling of 20748773 in words is "twenty million, seven hundred forty-eight thousand, seven hundred seventy-three".