20391141 has 8 divisors (see below), whose sum is σ = 27634144. Its totient is φ = 13371120.

The previous prime is 20391139. The next prime is 20391157. The reversal of 20391141 is 14119302.

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

It is not a de Polignac number, because 20391141 - 2¹ = 20391139 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 (20391101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55531 + ... + 55896.

It is an arithmetic number, because the mean of its divisors is an integer number (3454268).

Almost surely, 2^20391141 is an apocalyptic number.

It is an amenable number.

20391141 is a deficient number, since it is larger than the sum of its proper divisors (7243003).

20391141 is a wasteful number, since it uses less digits than its factorization.

20391141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111491.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20391141 is about 4515.6551019758. The cubic root of 20391141 is about 273.1998831340.

The spelling of 20391141 in words is "twenty million, three hundred ninety-one thousand, one hundred forty-one".