20440402404040 has 32 divisors (see below), whose sum is σ = 46412840331000. Its totient is φ = 8101150308864.

The previous prime is 20440402404013. The next prime is 20440402404043. The reversal of 20440402404040 is 4040420404402.

It can be written as a sum of positive squares in 4 ways, for example, as 20431683700164 + 8718703876 = 4520142^2 + 93374^2 .

It is a super-2 number, since 2×20440402404040² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20440402404043) 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, 2344078485 + ... + 2344087204.

Almost surely, 2^{20440402404040} is an apocalyptic number.

20440402404040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440402404040 is an abundant number, since it is smaller than the sum of its proper divisors (25972437926960).

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

20440402404040 is a wasteful number, since it uses less digits than its factorization.

20440402404040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4688165809 (or 4688165805 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 20440402404040 its reverse (4040420404402), we get a palindrome (24480822808442).

The spelling of 20440402404040 in words is "twenty trillion, four hundred forty billion, four hundred two million, four hundred four thousand, forty".