20404311 has 16 divisors (see below), whose sum is σ = 27911520. Its totient is φ = 13253760.

The previous prime is 20404261. The next prime is 20404331. The reversal of 20404311 is 11340402.

It is not a de Polignac number, because 20404311 - 2¹³ = 20396119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28425 + ... + 29133.

It is an arithmetic number, because the mean of its divisors is an integer number (1744470).

Almost surely, 2^20404311 is an apocalyptic number.

20404311 is a deficient number, since it is larger than the sum of its proper divisors (7507209).

20404311 is a wasteful number, since it uses less digits than its factorization.

20404311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 20404311 is about 4517.1131267658. The cubic root of 20404311 is about 273.2586875615.

Adding to 20404311 its reverse (11340402), we get a palindrome (31744713).

The spelling of 20404311 in words is "twenty million, four hundred four thousand, three hundred eleven".