20256823 has 2 divisors, whose sum is σ = 20256824. Its totient is φ = 20256822.

The previous prime is 20256811. The next prime is 20256851. The reversal of 20256823 is 32865202.

It is an a-pointer prime, because the next prime (20256851) can be obtained adding 20256823 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20256823 - 2¹⁷ = 20125751 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20256791 and 20256800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20256853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10128411 + 10128412.

It is an arithmetic number, because the mean of its divisors is an integer number (10128412).

Almost surely, 2^20256823 is an apocalyptic number.

20256823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20256823 is an equidigital number, since it uses as much as digits as its factorization.

20256823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 20256823 is about 4500.7580472627. The cubic root of 20256823 is about 272.5986983608.

The spelling of 20256823 in words is "twenty million, two hundred fifty-six thousand, eight hundred twenty-three".