20405043004145 has 8 divisors (see below), whose sum is σ = 24486676022760. Its totient is φ = 16323618124800.

The previous prime is 20405043004123. The next prime is 20405043004201. The reversal of 20405043004145 is 54140034050402.

It can be written as a sum of positive squares in 4 ways, for example, as 6354472972864 + 14050570031281 = 2520808^2 + 3748409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20405043004145 - 2⁸ = 20405043003889 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51819056 + ... + 52211345.

It is an arithmetic number, because the mean of its divisors is an integer number (3060834502845).

Almost surely, 2^{20405043004145} is an apocalyptic number.

It is an amenable number.

20405043004145 is a deficient number, since it is larger than the sum of its proper divisors (4081633018615).

20405043004145 is a wasteful number, since it uses less digits than its factorization.

20405043004145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104069635.

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 20405043004145 its reverse (54140034050402), we get a palindrome (74545077054547).

The spelling of 20405043004145 in words is "twenty trillion, four hundred five billion, forty-three million, four thousand, one hundred forty-five".