20413323310165 has 4 divisors (see below), whose sum is σ = 24495987972204. Its totient is φ = 16330658648128.

The previous prime is 20413323310157. The next prime is 20413323310267. The reversal of 20413323310165 is 56101332331402.

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 5793268700241 + 14620054609924 = 2406921^2 + 3823618^2 .

It is a cyclic number.

It is not a de Polignac number, because 20413323310165 - 2³ = 20413323310157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20413323310165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2041332331012 + ... + 2041332331021.

It is an arithmetic number, because the mean of its divisors is an integer number (6123996993051).

Almost surely, 2^{20413323310165} is an apocalyptic number.

It is an amenable number.

20413323310165 is a deficient number, since it is larger than the sum of its proper divisors (4082664662039).

20413323310165 is an equidigital number, since it uses as much as digits as its factorization.

20413323310165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082664662038.

The product of its (nonzero) digits is 38880, while the sum is 34.

Adding to 20413323310165 its reverse (56101332331402), we get a palindrome (76514655641567).

The spelling of 20413323310165 in words is "twenty trillion, four hundred thirteen billion, three hundred twenty-three million, three hundred ten thousand, one hundred sixty-five".