20365819 has 2 divisors, whose sum is σ = 20365820. Its totient is φ = 20365818.

The previous prime is 20365811. The next prime is 20365837. The reversal of 20365819 is 91856302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20365819 - 2³ = 20365811 is a prime.

It is a super-2 number, since 2×20365819² = 829533167081522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20365811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182909 + 10182910.

It is an arithmetic number, because the mean of its divisors is an integer number (10182910).

Almost surely, 2^20365819 is an apocalyptic number.

20365819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20365819 is an equidigital number, since it uses as much as digits as its factorization.

20365819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 20365819 is about 4512.8504296065. The cubic root of 20365819 is about 273.0867484967.

The spelling of 20365819 in words is "twenty million, three hundred sixty-five thousand, eight hundred nineteen".