20345032331511 has 4 divisors (see below), whose sum is σ = 27126709775352. Its totient is φ = 13563354887672.

The previous prime is 20345032331489. The next prime is 20345032331513. The reversal of 20345032331511 is 11513323054302.

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

It is a cyclic number.

It is not a de Polignac number, because 20345032331511 - 2⁷ = 20345032331383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345032331513) 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, 3390838721916 + ... + 3390838721921.

It is an arithmetic number, because the mean of its divisors is an integer number (6781677443838).

Almost surely, 2^{20345032331511} is an apocalyptic number.

20345032331511 is a deficient number, since it is larger than the sum of its proper divisors (6781677443841).

20345032331511 is an equidigital number, since it uses as much as digits as its factorization.

20345032331511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781677443840.

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 20345032331511 its reverse (11513323054302), we get a palindrome (31858355385813).

The spelling of 20345032331511 in words is "twenty trillion, three hundred forty-five billion, thirty-two million, three hundred thirty-one thousand, five hundred eleven".