20411904 has 80 divisors (see below), whose sum is σ = 55340208. Its totient is φ = 6684672.

The previous prime is 20411903. The next prime is 20411921. The reversal of 20411904 is 40911402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20411903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148924 + ... + 149060.

Almost surely, 2^20411904 is an apocalyptic number.

20411904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20411904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27670104).

20411904 is an abundant number, since it is smaller than the sum of its proper divisors (34928304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20411904 is an equidigital number, since it uses as much as digits as its factorization.

20411904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 20411904 is about 4517.9535190172. The cubic root of 20411904 is about 273.2925790252.

The spelling of 20411904 in words is "twenty million, four hundred eleven thousand, nine hundred four".