20841679 has 2 divisors, whose sum is σ = 20841680. Its totient is φ = 20841678.

The previous prime is 20841671. The next prime is 20841683. The reversal of 20841679 is 97614802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20841679 - 2³ = 20841671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20841671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420839 + 10420840.

It is an arithmetic number, because the mean of its divisors is an integer number (10420840).

Almost surely, 2^20841679 is an apocalyptic number.

20841679 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841679 is an equidigital number, since it uses as much as digits as its factorization.

20841679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 20841679 is about 4565.2687763154. The cubic root of 20841679 is about 275.1973415483.

The spelling of 20841679 in words is "twenty million, eight hundred forty-one thousand, six hundred seventy-nine".