20706823 has 2 divisors, whose sum is σ = 20706824. Its totient is φ = 20706822.

The previous prime is 20706821. The next prime is 20706869. The reversal of 20706823 is 32860702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20706823 - 2¹ = 20706821 is a prime.

Together with 20706821, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20706791 and 20706800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20706821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10353411 + 10353412.

It is an arithmetic number, because the mean of its divisors is an integer number (10353412).

Almost surely, 2^20706823 is an apocalyptic number.

20706823 is a deficient number, since it is larger than the sum of its proper divisors (1).

20706823 is an equidigital number, since it uses as much as digits as its factorization.

20706823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20706823 is about 4550.4750301480. The cubic root of 20706823 is about 274.6025022993.

The spelling of 20706823 in words is "twenty million, seven hundred six thousand, eight hundred twenty-three".