20994191 has 8 divisors (see below), whose sum is σ = 21652224. Its totient is φ = 20343960.

The previous prime is 20994179. The next prime is 20994209. The reversal of 20994191 is 19149902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20994191 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 (20994131) 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, 3770 + ... + 7496.

It is an arithmetic number, because the mean of its divisors is an integer number (2706528).

Almost surely, 2^20994191 is an apocalyptic number.

20994191 is a deficient number, since it is larger than the sum of its proper divisors (658033).

20994191 is a wasteful number, since it uses less digits than its factorization.

20994191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3901.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 20994191 is about 4581.9418372563. The cubic root of 20994191 is about 275.8669762595.

The spelling of 20994191 in words is "twenty million, nine hundred ninety-four thousand, one hundred ninety-one".