20267191 has 8 divisors (see below), whose sum is σ = 23379840. Its totient is φ = 17208888.

The previous prime is 20267119. The next prime is 20267197. The reversal of 20267191 is 19176202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20267191 - 2¹⁷ = 20136119 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 (20267197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12781 + ... + 14278.

It is an arithmetic number, because the mean of its divisors is an integer number (2922480).

Almost surely, 2^20267191 is an apocalyptic number.

20267191 is a deficient number, since it is larger than the sum of its proper divisors (3112649).

20267191 is a wasteful number, since it uses less digits than its factorization.

20267191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27173.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 20267191 is about 4501.9097058915. The cubic root of 20267191 is about 272.6451982693.

The spelling of 20267191 in words is "twenty million, two hundred sixty-seven thousand, one hundred ninety-one".