20440398050 has 18 divisors (see below), whose sum is σ = 38021020833. Its totient is φ = 8175754840.

The previous prime is 20440398023. The next prime is 20440398053. The reversal of 20440398050 is 5089304402.

It can be written as a sum of positive squares in 2 ways, for example, as 20031590089 + 408807961 = 141533^2 + 20219^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101095.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20440398050.

It is not an unprimeable number, because it can be changed into a prime (20440398053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1000841 + ... + 1021059.

Almost surely, 2^20440398050 is an apocalyptic number.

20440398050 is a deficient number, since it is larger than the sum of its proper divisors (17580622783).

20440398050 is an frugal number, since it uses more digits than its factorization.

20440398050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40450 (or 20226 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 20440398050 in words is "twenty billion, four hundred forty million, three hundred ninety-eight thousand, fifty".