20842319 has 2 divisors, whose sum is σ = 20842320. Its totient is φ = 20842318.

The previous prime is 20842279. The next prime is 20842337. The reversal of 20842319 is 91324802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20842319 is a prime.

It is a super-2 number, since 2×20842319² = 868804522595522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20842291 and 20842300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20842219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10421159 + 10421160.

It is an arithmetic number, because the mean of its divisors is an integer number (10421160).

Almost surely, 2^20842319 is an apocalyptic number.

20842319 is a deficient number, since it is larger than the sum of its proper divisors (1).

20842319 is an equidigital number, since it uses as much as digits as its factorization.

20842319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 20842319 is about 4565.3388702264. The cubic root of 20842319 is about 275.2001584118.

The spelling of 20842319 in words is "twenty million, eight hundred forty-two thousand, three hundred nineteen".