20747873 has 2 divisors, whose sum is σ = 20747874. Its totient is φ = 20747872.

The previous prime is 20747827. The next prime is 20747879. The reversal of 20747873 is 37874702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20539024 + 208849 = 4532^2 + 457^2 .

It is a cyclic number.

It is not a de Polignac number, because 20747873 - 2⁶ = 20747809 is a prime.

It is not a weakly prime, because it can be changed into another prime (20747879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10373936 + 10373937.

It is an arithmetic number, because the mean of its divisors is an integer number (10373937).

Almost surely, 2^20747873 is an apocalyptic number.

It is an amenable number.

20747873 is a deficient number, since it is larger than the sum of its proper divisors (1).

20747873 is an equidigital number, since it uses as much as digits as its factorization.

20747873 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 20747873 is about 4554.9833150079. The cubic root of 20747873 is about 274.7838433633.

The spelling of 20747873 in words is "twenty million, seven hundred forty-seven thousand, eight hundred seventy-three".