20780423 has 2 divisors, whose sum is σ = 20780424. Its totient is φ = 20780422.

The previous prime is 20780411. The next prime is 20780453. The reversal of 20780423 is 32408702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20780423 - 2¹⁴ = 20764039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20780392 and 20780401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20780453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10390211 + 10390212.

It is an arithmetic number, because the mean of its divisors is an integer number (10390212).

Almost surely, 2^20780423 is an apocalyptic number.

20780423 is a deficient number, since it is larger than the sum of its proper divisors (1).

20780423 is an equidigital number, since it uses as much as digits as its factorization.

20780423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20780423 is about 4558.5549245347. The cubic root of 20780423 is about 274.9274651672.

The spelling of 20780423 in words is "twenty million, seven hundred eighty thousand, four hundred twenty-three".