20453191 has 8 divisors (see below), whose sum is σ = 22345344. Its totient is φ = 18566520.

The previous prime is 20453171. The next prime is 20453201. The reversal of 20453191 is 19135402.

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 20453191 - 2¹⁷ = 20322119 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 (20453171) 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, 13620 + ... + 15046.

It is an arithmetic number, because the mean of its divisors is an integer number (2793168).

Almost surely, 2^20453191 is an apocalyptic number.

20453191 is a deficient number, since it is larger than the sum of its proper divisors (1892153).

20453191 is a wasteful number, since it uses less digits than its factorization.

20453191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2741.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20453191 is about 4522.5204256034. The cubic root of 20453191 is about 273.4767171898.

Adding to 20453191 its reverse (19135402), we get a palindrome (39588593).

The spelling of 20453191 in words is "twenty million, four hundred fifty-three thousand, one hundred ninety-one".