20730533 has 2 divisors, whose sum is σ = 20730534. Its totient is φ = 20730532.

The previous prime is 20730529. The next prime is 20730551. The reversal of 20730533 is 33503702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17833729 + 2896804 = 4223^2 + 1702^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730533 - 2² = 20730529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20730499 and 20730508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20730233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365266 + 10365267.

It is an arithmetic number, because the mean of its divisors is an integer number (10365267).

Almost surely, 2^20730533 is an apocalyptic number.

It is an amenable number.

20730533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730533 is an equidigital number, since it uses as much as digits as its factorization.

20730533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 23.

The square root of 20730533 is about 4553.0795073225. The cubic root of 20730533 is about 274.7072719828.

The spelling of 20730533 in words is "twenty million, seven hundred thirty thousand, five hundred thirty-three".