20719399 has 2 divisors, whose sum is σ = 20719400. Its totient is φ = 20719398.

The previous prime is 20719381. The next prime is 20719411. The reversal of 20719399 is 99391702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20719399 - 2⁷ = 20719271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20719319) 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, 10359699 + 10359700.

It is an arithmetic number, because the mean of its divisors is an integer number (10359700).

Almost surely, 2^20719399 is an apocalyptic number.

20719399 is a deficient number, since it is larger than the sum of its proper divisors (1).

20719399 is an equidigital number, since it uses as much as digits as its factorization.

20719399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 20719399 is about 4551.8566541577. The cubic root of 20719399 is about 274.6580830481.

The spelling of 20719399 in words is "twenty million, seven hundred nineteen thousand, three hundred ninety-nine".