20740823 has 2 divisors, whose sum is σ = 20740824. Its totient is φ = 20740822.

The previous prime is 20740789. The next prime is 20740849. The reversal of 20740823 is 32804702.

It is an a-pointer prime, because the next prime (20740849) can be obtained adding 20740823 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20740823 - 2¹⁰ = 20739799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20740792 and 20740801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20740873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370411 + 10370412.

It is an arithmetic number, because the mean of its divisors is an integer number (10370412).

Almost surely, 2^20740823 is an apocalyptic number.

20740823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20740823 is an equidigital number, since it uses as much as digits as its factorization.

20740823 is an evil number, because the sum of its binary digits is even.

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

The square root of 20740823 is about 4554.2093715595. The cubic root of 20740823 is about 274.7527165492.

The spelling of 20740823 in words is "twenty million, seven hundred forty thousand, eight hundred twenty-three".