20404371 has 16 divisors (see below), whose sum is σ = 30310560. Its totient is φ = 12122880.

The previous prime is 20404361. The next prime is 20404387. The reversal of 20404371 is 17340402.

It is not a de Polignac number, because 20404371 - 2¹³ = 20396179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20404331) 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 15 ways as a sum of consecutive naturals, for example, 7890 + ... + 10151.

It is an arithmetic number, because the mean of its divisors is an integer number (1894410).

Almost surely, 2^20404371 is an apocalyptic number.

20404371 is a deficient number, since it is larger than the sum of its proper divisors (9906189).

20404371 is a wasteful number, since it uses less digits than its factorization.

20404371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18086.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20404371 is about 4517.1197681709. The cubic root of 20404371 is about 273.2589554053.

Adding to 20404371 its reverse (17340402), we get a palindrome (37744773).

The spelling of 20404371 in words is "twenty million, four hundred four thousand, three hundred seventy-one".