20445443426 has 4 divisors (see below), whose sum is σ = 30668165142. Its totient is φ = 10222721712.

The previous prime is 20445443413. The next prime is 20445443437. The reversal of 20445443426 is 62434454402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62434454402 = 2 ⋅31217227201.

It can be written as a sum of positive squares in only one way, i.e., 12633535201 + 7811908225 = 112399^2 + 88385^2 .

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 20445443426.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5111360855 + ... + 5111360858.

Almost surely, 2^20445443426 is an apocalyptic number.

20445443426 is a deficient number, since it is larger than the sum of its proper divisors (10222721716).

20445443426 is a wasteful number, since it uses less digits than its factorization.

20445443426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10222721715.

The product of its (nonzero) digits is 368640, while the sum is 38.

Adding to 20445443426 its reverse (62434454402), we get a palindrome (82879897828).

The spelling of 20445443426 in words is "twenty billion, four hundred forty-five million, four hundred forty-three thousand, four hundred twenty-six".