20423552541165 has 20 divisors (see below), whose sum is σ = 36611109000444. Its totient is φ = 10892561355072.

The previous prime is 20423552541059. The next prime is 20423552541167. The reversal of 20423552541165 is 56114525532402.

20423552541165 is a `hidden beast` number, since 2 + 0 + 4 + 2 + 3 + 5 + 525 + 4 + 116 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8063680274244 + 12359872266921 = 2839662^2 + 3515661^2 .

It is not a de Polignac number, because 20423552541165 - 2⁹ = 20423552540653 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 20423552541165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423552541167) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25214261992 + ... + 25214262801.

Almost surely, 2^{20423552541165} is an apocalyptic number.

It is an amenable number.

20423552541165 is a deficient number, since it is larger than the sum of its proper divisors (16187556459279).

20423552541165 is an equidigital number, since it uses as much as digits as its factorization.

20423552541165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50428524810 (or 50428524801 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 45.

The spelling of 20423552541165 in words is "twenty trillion, four hundred twenty-three billion, five hundred fifty-two million, five hundred forty-one thousand, one hundred sixty-five".