20747273 has 2 divisors, whose sum is σ = 20747274. Its totient is φ = 20747272.

The previous prime is 20747263. The next prime is 20747299. The reversal of 20747273 is 37274702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20720704 + 26569 = 4552^2 + 163^2 .

It is a cyclic number.

It is not a de Polignac number, because 20747273 - 2¹⁰ = 20746249 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20747203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373636 + 10373637.

It is an arithmetic number, because the mean of its divisors is an integer number (10373637).

Almost surely, 2^20747273 is an apocalyptic number.

It is an amenable number.

20747273 is a deficient number, since it is larger than the sum of its proper divisors (1).

20747273 is an equidigital number, since it uses as much as digits as its factorization.

20747273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16464, while the sum is 32.

The square root of 20747273 is about 4554.9174526000. The cubic root of 20747273 is about 274.7811945473.

The spelling of 20747273 in words is "twenty million, seven hundred forty-seven thousand, two hundred seventy-three".