20354665523421 has 16 divisors (see below), whose sum is σ = 28076011608960. Its totient is φ = 13101568589760.

The previous prime is 20354665523383. The next prime is 20354665523447. The reversal of 20354665523421 is 12432556645302.

It is not a de Polignac number, because 20354665523421 - 2³⁰ = 20353591781597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20354665523221) 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, 1512976 + ... + 6557318.

It is an arithmetic number, because the mean of its divisors is an integer number (1754750725560).

Almost surely, 2^{20354665523421} is an apocalyptic number.

It is an amenable number.

20354665523421 is a deficient number, since it is larger than the sum of its proper divisors (7721346085539).

20354665523421 is a wasteful number, since it uses less digits than its factorization.

20354665523421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5090756.

The product of its (nonzero) digits is 5184000, while the sum is 48.

The spelling of 20354665523421 in words is "twenty trillion, three hundred fifty-four billion, six hundred sixty-five million, five hundred twenty-three thousand, four hundred twenty-one".