20305103131 has 4 divisors (see below), whose sum is σ = 20307154000. Its totient is φ = 20303052264.

The previous prime is 20305103129. The next prime is 20305103173. The reversal of 20305103131 is 13130150302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13130150302 = 2 ⋅6565075151.

It is a cyclic number.

It is not a de Polignac number, because 20305103131 - 2¹ = 20305103129 is a prime.

It is a super-2 number, since 2×20305103131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20305103099 and 20305103108.

It is not an unprimeable number, because it can be changed into a prime (20305103111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1010511 + ... + 1030408.

It is an arithmetic number, because the mean of its divisors is an integer number (5076788500).

Almost surely, 2^20305103131 is an apocalyptic number.

20305103131 is a deficient number, since it is larger than the sum of its proper divisors (2050869).

20305103131 is an equidigital number, since it uses as much as digits as its factorization.

20305103131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050868.

The product of its (nonzero) digits is 270, while the sum is 19.

Adding to 20305103131 its reverse (13130150302), we get a palindrome (33435253433).

The spelling of 20305103131 in words is "twenty billion, three hundred five million, one hundred three thousand, one hundred thirty-one".