20824879 has 2 divisors, whose sum is σ = 20824880. Its totient is φ = 20824878.

The previous prime is 20824877. The next prime is 20824889. The reversal of 20824879 is 97842802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20824879 - 2¹ = 20824877 is a prime.

Together with 20824877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20824877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10412439 + 10412440.

It is an arithmetic number, because the mean of its divisors is an integer number (10412440).

Almost surely, 2^20824879 is an apocalyptic number.

20824879 is a deficient number, since it is larger than the sum of its proper divisors (1).

20824879 is an equidigital number, since it uses as much as digits as its factorization.

20824879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 20824879 is about 4563.4284260849. The cubic root of 20824879 is about 275.1233782471.

The spelling of 20824879 in words is "twenty million, eight hundred twenty-four thousand, eight hundred seventy-nine".