20391074 has 8 divisors (see below), whose sum is σ = 33367248. Its totient is φ = 9268660.

The previous prime is 20391071. The next prime is 20391101. The reversal of 20391074 is 47019302.

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

It is not an unprimeable number, because it can be changed into a prime (20391071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463412 + ... + 463455.

It is an arithmetic number, because the mean of its divisors is an integer number (4170906).

Almost surely, 2^20391074 is an apocalyptic number.

20391074 is a deficient number, since it is larger than the sum of its proper divisors (12976174).

20391074 is a wasteful number, since it uses less digits than its factorization.

20391074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926880.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 20391074 is about 4515.6476833340. The cubic root of 20391074 is about 273.1995839124.

It can be divided in two parts, 2039 and 1074, that added together give a palindrome (3113).

The spelling of 20391074 in words is "twenty million, three hundred ninety-one thousand, seventy-four".