20404367 has 4 divisors (see below), whose sum is σ = 20414040. Its totient is φ = 20394696.

The previous prime is 20404361. The next prime is 20404387. The reversal of 20404367 is 76340402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20404367 - 2¹² = 20400271 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 (20404361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173 + ... + 6390.

It is an arithmetic number, because the mean of its divisors is an integer number (5103510).

Almost surely, 2^20404367 is an apocalyptic number.

20404367 is a deficient number, since it is larger than the sum of its proper divisors (9673).

20404367 is an equidigital number, since it uses as much as digits as its factorization.

20404367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9672.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 20404367 is about 4517.1193254108. The cubic root of 20404367 is about 273.2589375491.

Adding to 20404367 its reverse (76340402), we get a palindrome (96744769).

The spelling of 20404367 in words is "twenty million, four hundred four thousand, three hundred sixty-seven".