20404147 has 8 divisors (see below), whose sum is σ = 20851200. Its totient is φ = 19960584.

The previous prime is 20404133. The next prime is 20404159. The reversal of 20404147 is 74140402.

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

It is a cyclic number.

It is not a de Polignac number, because 20404147 - 2¹¹ = 20402099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20404127) 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, 13378 + ... + 14824.

It is an arithmetic number, because the mean of its divisors is an integer number (2606400).

Almost surely, 2^20404147 is an apocalyptic number.

20404147 is a deficient number, since it is larger than the sum of its proper divisors (447053).

20404147 is a wasteful number, since it uses less digits than its factorization.

20404147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1745.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 20404147 is about 4517.0949735422. The cubic root of 20404147 is about 273.2579554524.

Adding to 20404147 its reverse (74140402), we get a palindrome (94544549).

The spelling of 20404147 in words is "twenty million, four hundred four thousand, one hundred forty-seven".