20120345503 has 2 divisors, whose sum is σ = 20120345504. Its totient is φ = 20120345502.

The previous prime is 20120345491. The next prime is 20120345527. The reversal of 20120345503 is 30554302102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120345503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120345593) 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, 10060172751 + 10060172752.

It is an arithmetic number, because the mean of its divisors is an integer number (10060172752).

Almost surely, 2^20120345503 is an apocalyptic number.

20120345503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120345503 is an equidigital number, since it uses as much as digits as its factorization.

20120345503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 25.

Adding to 20120345503 its reverse (30554302102), we get a palindrome (50674647605).

The spelling of 20120345503 in words is "twenty billion, one hundred twenty million, three hundred forty-five thousand, five hundred three".