20191967 has 4 divisors (see below), whose sum is σ = 20684496. Its totient is φ = 19699440.

The previous prime is 20191931. The next prime is 20191987. The reversal of 20191967 is 76919102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20191967 - 2¹⁰ = 20190943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20191987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246203 + ... + 246284.

It is an arithmetic number, because the mean of its divisors is an integer number (5171124).

Almost surely, 2^20191967 is an apocalyptic number.

20191967 is a deficient number, since it is larger than the sum of its proper divisors (492529).

20191967 is an equidigital number, since it uses as much as digits as its factorization.

20191967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492528.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 20191967 is about 4493.5472624643. The cubic root of 20191967 is about 272.3074621181.

The spelling of 20191967 in words is "twenty million, one hundred ninety-one thousand, nine hundred sixty-seven".