20404111 has 8 divisors (see below), whose sum is σ = 25112864. Its totient is φ = 16143840.

The previous prime is 20404093. The next prime is 20404123. The reversal of 20404111 is 11140402.

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 20404111 - 2¹³ = 20395919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 20404091 and 20404100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404171) 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, 112020 + ... + 112201.

It is an arithmetic number, because the mean of its divisors is an integer number (3139108).

Almost surely, 2^20404111 is an apocalyptic number.

20404111 is a deficient number, since it is larger than the sum of its proper divisors (4708753).

20404111 is a wasteful number, since it uses less digits than its factorization.

20404111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224241.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20404111 is about 4517.0909886784. The cubic root of 20404111 is about 273.2577947450.

Adding to 20404111 its reverse (11140402), we get a palindrome (31544513).

The spelling of 20404111 in words is "twenty million, four hundred four thousand, one hundred eleven".