20891193 has 8 divisors (see below), whose sum is σ = 27951168. Its totient is φ = 13879344.

The previous prime is 20891161. The next prime is 20891197. The reversal of 20891193 is 39119802.

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

It is not a de Polignac number, because 20891193 - 2⁵ = 20891161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20891197) 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, 11005 + ... + 12762.

It is an arithmetic number, because the mean of its divisors is an integer number (3493896).

Almost surely, 2^20891193 is an apocalyptic number.

It is an amenable number.

20891193 is a deficient number, since it is larger than the sum of its proper divisors (7059975).

20891193 is a wasteful number, since it uses less digits than its factorization.

20891193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24063.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 20891193 is about 4570.6884601775. The cubic root of 20891193 is about 275.4150998324.

The spelling of 20891193 in words is "twenty million, eight hundred ninety-one thousand, one hundred ninety-three".