20104440040 has 32 divisors (see below), whose sum is σ = 47895873480. Its totient is φ = 7568730112.

The previous prime is 20104440029. The next prime is 20104440043. The reversal of 20104440040 is 4004440102.

It can be written as a sum of positive squares in 4 ways, for example, as 17355954564 + 2748485476 = 131742^2 + 52426^2 .

It is not an unprimeable number, because it can be changed into a prime (20104440043) 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, 14781997 + ... + 14783356.

Almost surely, 2^20104440040 is an apocalyptic number.

20104440040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20104440040 is an abundant number, since it is smaller than the sum of its proper divisors (27791433440).

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

20104440040 is a wasteful number, since it uses less digits than its factorization.

20104440040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29565381 (or 29565377 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 20104440040 its reverse (4004440102), we get a palindrome (24108880142).

The spelling of 20104440040 in words is "twenty billion, one hundred four million, four hundred forty thousand, forty".