20447723 has 2 divisors, whose sum is σ = 20447724. Its totient is φ = 20447722.

The previous prime is 20447711. The next prime is 20447729. The reversal of 20447723 is 32774402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20447723 - 2⁸ = 20447467 is a prime.

It is not a weakly prime, because it can be changed into another prime (20447729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223861 + 10223862.

It is an arithmetic number, because the mean of its divisors is an integer number (10223862).

Almost surely, 2^20447723 is an apocalyptic number.

20447723 is a deficient number, since it is larger than the sum of its proper divisors (1).

20447723 is an equidigital number, since it uses as much as digits as its factorization.

20447723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9408, while the sum is 29.

The square root of 20447723 is about 4521.9158550331. The cubic root of 20447723 is about 273.4523444001.

It can be divided in two parts, 2044772 and 3, that multiplied together give a palindrome (6134316).

The spelling of 20447723 in words is "twenty million, four hundred forty-seven thousand, seven hundred twenty-three".