20191073 has 4 divisors (see below), whose sum is σ = 23075520. Its totient is φ = 17306628.

The previous prime is 20191069. The next prime is 20191109. The reversal of 20191073 is 37019102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37019102 = 2 ⋅18509551.

It is a cyclic number.

It is not a de Polignac number, because 20191073 - 2² = 20191069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20191043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442213 + ... + 1442226.

It is an arithmetic number, because the mean of its divisors is an integer number (5768880).

Almost surely, 2^20191073 is an apocalyptic number.

It is an amenable number.

20191073 is a deficient number, since it is larger than the sum of its proper divisors (2884447).

20191073 is an equidigital number, since it uses as much as digits as its factorization.

20191073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884446.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 20191073 is about 4493.4477853871. The cubic root of 20191073 is about 272.3034432516.

The spelling of 20191073 in words is "twenty million, one hundred ninety-one thousand, seventy-three".