20120332391 has 2 divisors, whose sum is σ = 20120332392. Its totient is φ = 20120332390.

The previous prime is 20120332361. The next prime is 20120332429. The reversal of 20120332391 is 19323302102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20120332391 - 2²⁶ = 20053223527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20120332391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120332301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060166195 + 10060166196.

It is an arithmetic number, because the mean of its divisors is an integer number (10060166196).

Almost surely, 2^20120332391 is an apocalyptic number.

20120332391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120332391 is an equidigital number, since it uses as much as digits as its factorization.

20120332391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 20120332391 its reverse (19323302102), we get a palindrome (39443634493).

The spelling of 20120332391 in words is "twenty billion, one hundred twenty million, three hundred thirty-two thousand, three hundred ninety-one".