20784733 has 2 divisors, whose sum is σ = 20784734. Its totient is φ = 20784732.

The previous prime is 20784721. The next prime is 20784767. The reversal of 20784733 is 33748702.

It is an a-pointer prime, because the next prime (20784767) can be obtained adding 20784733 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19740249 + 1044484 = 4443^2 + 1022^2 .

It is a cyclic number.

It is not a de Polignac number, because 20784733 - 2⁹ = 20784221 is a prime.

It is a super-3 number, since 3×20784733³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20784703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10392366 + 10392367.

It is an arithmetic number, because the mean of its divisors is an integer number (10392367).

Almost surely, 2^20784733 is an apocalyptic number.

It is an amenable number.

20784733 is a deficient number, since it is larger than the sum of its proper divisors (1).

20784733 is an equidigital number, since it uses as much as digits as its factorization.

20784733 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 20784733 is about 4559.0276375561. The cubic root of 20784733 is about 274.9464711240.

The spelling of 20784733 in words is "twenty million, seven hundred eighty-four thousand, seven hundred thirty-three".