20307143406513 has 4 divisors (see below), whose sum is σ = 27076191208688. Its totient is φ = 13538095604340.

The previous prime is 20307143406503. The next prime is 20307143406569. The reversal of 20307143406513 is 31560434170302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20307143406513 - 2⁸ = 20307143406257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20307143406503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3384523901083 + ... + 3384523901088.

It is an arithmetic number, because the mean of its divisors is an integer number (6769047802172).

Almost surely, 2^{20307143406513} is an apocalyptic number.

It is an amenable number.

20307143406513 is a deficient number, since it is larger than the sum of its proper divisors (6769047802175).

20307143406513 is an equidigital number, since it uses as much as digits as its factorization.

20307143406513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6769047802174.

The product of its (nonzero) digits is 181440, while the sum is 39.

Adding to 20307143406513 its reverse (31560434170302), we get a palindrome (51867577576815).

The spelling of 20307143406513 in words is "twenty trillion, three hundred seven billion, one hundred forty-three million, four hundred six thousand, five hundred thirteen".