20355019 has 2 divisors, whose sum is σ = 20355020. Its totient is φ = 20355018.

The previous prime is 20355011. The next prime is 20355031. The reversal of 20355019 is 91055302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20355019 - 2³ = 20355011 is a prime.

It is a super-2 number, since 2×20355019² = 828653596980722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20354984 and 20355002.

It is not a weakly prime, because it can be changed into another prime (20355011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177509 + 10177510.

It is an arithmetic number, because the mean of its divisors is an integer number (10177510).

Almost surely, 2^20355019 is an apocalyptic number.

20355019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355019 is an equidigital number, since it uses as much as digits as its factorization.

20355019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 20355019 is about 4511.6536879508. The cubic root of 20355019 is about 273.0384672993.

The spelling of 20355019 in words is "twenty million, three hundred fifty-five thousand, nineteen".