20730733 has 2 divisors, whose sum is σ = 20730734. Its totient is φ = 20730732.

The previous prime is 20730719. The next prime is 20730739. The reversal of 20730733 is 33703702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19333609 + 1397124 = 4397^2 + 1182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20730733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20730698 and 20730707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20730739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10365366 + 10365367.

It is an arithmetic number, because the mean of its divisors is an integer number (10365367).

Almost surely, 2^20730733 is an apocalyptic number.

It is an amenable number.

20730733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730733 is an equidigital number, since it uses as much as digits as its factorization.

20730733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646, while the sum is 25.

The square root of 20730733 is about 4553.1014704265. The cubic root of 20730733 is about 274.7081554024.

The spelling of 20730733 in words is "twenty million, seven hundred thirty thousand, seven hundred thirty-three".