20310919 has 2 divisors, whose sum is σ = 20310920. Its totient is φ = 20310918.

The previous prime is 20310911. The next prime is 20310923. The reversal of 20310919 is 91901302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20310919 - 2³ = 20310911 is a prime.

It is a super-2 number, since 2×20310919² = 825066861249122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20310893 and 20310902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155459 + 10155460.

It is an arithmetic number, because the mean of its divisors is an integer number (10155460).

Almost surely, 2^20310919 is an apocalyptic number.

20310919 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310919 is an equidigital number, since it uses as much as digits as its factorization.

20310919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 20310919 is about 4506.7636947149. The cubic root of 20310919 is about 272.8411416395.

The spelling of 20310919 in words is "twenty million, three hundred ten thousand, nine hundred nineteen".