20784263 has 2 divisors, whose sum is σ = 20784264. Its totient is φ = 20784262.

The previous prime is 20784241. The next prime is 20784277. The reversal of 20784263 is 36248702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20784263 - 2¹⁰ = 20783239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20784223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10392131 + 10392132.

It is an arithmetic number, because the mean of its divisors is an integer number (10392132).

Almost surely, 2^20784263 is an apocalyptic number.

20784263 is a deficient number, since it is larger than the sum of its proper divisors (1).

20784263 is an equidigital number, since it uses as much as digits as its factorization.

20784263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20784263 is about 4558.9760911854. The cubic root of 20784263 is about 274.9443986763.

The spelling of 20784263 in words is "twenty million, seven hundred eighty-four thousand, two hundred sixty-three".