20404408336 has 135 divisors (see below), whose sum is σ = 44542756503. Its totient is φ = 9050595840.

The previous prime is 20404408273. The next prime is 20404408337. The reversal of 20404408336 is 63380440402.

The square root of 20404408336 is 142844.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 13590896400 + 6813511936 = 116580^2 + 82544^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20404408337) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 304543375 + ... + 304543441.

Almost surely, 2^20404408336 is an apocalyptic number.

20404408336 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20404408336 is the 142844-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20404408336

20404408336 is an abundant number, since it is smaller than the sum of its proper divisors (24138348167).

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

20404408336 is an equidigital number, since it uses as much as digits as its factorization.

20404408336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 20404408336 its reverse (63380440402), we get a palindrome (83784848738).

The spelling of 20404408336 in words is "twenty billion, four hundred four million, four hundred eight thousand, three hundred thirty-six".