20440200420040 has 64 divisors (see below), whose sum is σ = 46684064271600. Its totient is φ = 8053076754432.

The previous prime is 20440200420023. The next prime is 20440200420041. The reversal of 20440200420040 is 4002400204402.

It can be written as a sum of positive squares in 8 ways, for example, as 9138057418084 + 11302143001956 = 3022922^2 + 3361866^2 .

It is a super-2 number, since 2×20440200420040² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20440200419993 and 20440200420020.

It is not an unprimeable number, because it can be changed into a prime (20440200420041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2634585 + ... + 6915304.

Almost surely, 2^{20440200420040} is an apocalyptic number.

20440200420040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440200420040 is an abundant number, since it is smaller than the sum of its proper divisors (26243863851560).

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

20440200420040 is a wasteful number, since it uses less digits than its factorization.

20440200420040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9550706 (or 9550702 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 20440200420040 its reverse (4002400204402), we get a palindrome (24442600624442).

The spelling of 20440200420040 in words is "twenty trillion, four hundred forty billion, two hundred million, four hundred twenty thousand, forty".