20194191 has 10 divisors (see below), whose sum is σ = 30166752. Its totient is φ = 13462740.

The previous prime is 20194183. The next prime is 20194241. The reversal of 20194191 is 19149102.

It is not a de Polignac number, because 20194191 - 2³ = 20194183 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20193191) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124575 + ... + 124736.

Almost surely, 2^20194191 is an apocalyptic number.

20194191 is a deficient number, since it is larger than the sum of its proper divisors (9972561).

20194191 is an equidigital number, since it uses as much as digits as its factorization.

20194191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249323 (or 249314 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 20194191 is about 4493.7947216133. The cubic root of 20194191 is about 272.3174593209.

The spelling of 20194191 in words is "twenty million, one hundred ninety-four thousand, one hundred ninety-one".