20197019 has 4 divisors (see below), whose sum is σ = 21260040. Its totient is φ = 19134000.

The previous prime is 20197007. The next prime is 20197069. The reversal of 20197019 is 91079102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91079102 = 2 ⋅45539551.

It is a cyclic number.

It is not a de Polignac number, because 20197019 - 2²⁴ = 3419803 is a prime.

It is a super-2 number, since 2×20197019² = 815839152972722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20196982 and 20197000.

It is not an unprimeable number, because it can be changed into a prime (20197069) 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 in 3 ways as a sum of consecutive naturals, for example, 531482 + ... + 531519.

It is an arithmetic number, because the mean of its divisors is an integer number (5315010).

Almost surely, 2^20197019 is an apocalyptic number.

20197019 is a deficient number, since it is larger than the sum of its proper divisors (1063021).

20197019 is a wasteful number, since it uses less digits than its factorization.

20197019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063020.

The product of its (nonzero) digits is 1134, while the sum is 29.

The square root of 20197019 is about 4494.1093667155. The cubic root of 20197019 is about 272.3301705312.

The spelling of 20197019 in words is "twenty million, one hundred ninety-seven thousand, nineteen".