20305342331 has 4 divisors (see below), whose sum is σ = 20312254200. Its totient is φ = 20298430464.

The previous prime is 20305342319. The next prime is 20305342339. The reversal of 20305342331 is 13324350302.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13324350302 = 2 ⋅6662175151.

It is a cyclic number.

It is not a de Polignac number, because 20305342331 - 2¹⁴ = 20305325947 is a prime.

It is a super-2 number, since 2×20305342331² (a number of 21 digits) contains 22 as substring.

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 20305342331.

It is not an unprimeable number, because it can be changed into a prime (20305342339) 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, 3451526 + ... + 3457403.

It is an arithmetic number, because the mean of its divisors is an integer number (5078063550).

Almost surely, 2^20305342331 is an apocalyptic number.

20305342331 is a deficient number, since it is larger than the sum of its proper divisors (6911869).

20305342331 is an equidigital number, since it uses as much as digits as its factorization.

20305342331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6911868.

The product of its (nonzero) digits is 6480, while the sum is 26.

Adding to 20305342331 its reverse (13324350302), we get a palindrome (33629692633).

The spelling of 20305342331 in words is "twenty billion, three hundred five million, three hundred forty-two thousand, three hundred thirty-one".