20450143054505 has 32 divisors (see below), whose sum is σ = 24813711136800. Its totient is φ = 16178867077120.

The previous prime is 20450143054501. The next prime is 20450143054541. The reversal of 20450143054505 is 50545034105402.

It can be written as a sum of positive squares in 16 ways, for example, as 2504176486681 + 17945966567824 = 1582459^2 + 4236268^2 .

It is not a de Polignac number, because 20450143054505 - 2² = 20450143054501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20450143054501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168512729 + ... + 168634041.

It is an arithmetic number, because the mean of its divisors is an integer number (775428473025).

Almost surely, 2^{20450143054505} is an apocalyptic number.

It is an amenable number.

20450143054505 is a deficient number, since it is larger than the sum of its proper divisors (4363568082295).

20450143054505 is a wasteful number, since it uses less digits than its factorization.

20450143054505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122461.

The product of its (nonzero) digits is 240000, while the sum is 38.

Adding to 20450143054505 its reverse (50545034105402), we get a palindrome (70995177159907).

The spelling of 20450143054505 in words is "twenty trillion, four hundred fifty billion, one hundred forty-three million, fifty-four thousand, five hundred five".