20231312365645 has 4 divisors (see below), whose sum is σ = 24277574838780. Its totient is φ = 16185049892512.

The previous prime is 20231312365573. The next prime is 20231312365661. The reversal of 20231312365645 is 54656321313202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10201208008489 + 10030104357156 = 3193933^2 + 3167034^2 .

It is a cyclic number.

It is not a de Polignac number, because 20231312365645 - 2²³ = 20231303977037 is a prime.

It is a super-3 number, since 3×20231312365645³ (a number of 41 digits) contains 333 as substring.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 2023131236560 + ... + 2023131236569.

It is an arithmetic number, because the mean of its divisors is an integer number (6069393709695).

Almost surely, 2^{20231312365645} is an apocalyptic number.

It is an amenable number.

20231312365645 is a deficient number, since it is larger than the sum of its proper divisors (4046262473135).

20231312365645 is an equidigital number, since it uses as much as digits as its factorization.

20231312365645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4046262473134.

The product of its (nonzero) digits is 777600, while the sum is 43.

Adding to 20231312365645 its reverse (54656321313202), we get a palindrome (74887633678847).

The spelling of 20231312365645 in words is "twenty trillion, two hundred thirty-one billion, three hundred twelve million, three hundred sixty-five thousand, six hundred forty-five".