20457733 has 2 divisors, whose sum is σ = 20457734. Its totient is φ = 20457732.

The previous prime is 20457709. The next prime is 20457751. The reversal of 20457733 is 33775402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18378369 + 2079364 = 4287^2 + 1442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20457733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20457695 and 20457704.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20457793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228866 + 10228867.

It is an arithmetic number, because the mean of its divisors is an integer number (10228867).

Almost surely, 2^20457733 is an apocalyptic number.

It is an amenable number.

20457733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20457733 is an equidigital number, since it uses as much as digits as its factorization.

20457733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640, while the sum is 31.

The square root of 20457733 is about 4523.0225513477. The cubic root of 20457733 is about 273.4969591709.

The spelling of 20457733 in words is "twenty million, four hundred fifty-seven thousand, seven hundred thirty-three".