20311130503 has 2 divisors, whose sum is σ = 20311130504. Its totient is φ = 20311130502.

The previous prime is 20311130431. The next prime is 20311130597. The reversal of 20311130503 is 30503111302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20311130503 - 2⁹ = 20311129991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20311130003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155565251 + 10155565252.

It is an arithmetic number, because the mean of its divisors is an integer number (10155565252).

Almost surely, 2^20311130503 is an apocalyptic number.

20311130503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311130503 is an equidigital number, since it uses as much as digits as its factorization.

20311130503 is an evil number, because the sum of its binary digits is even.

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

Adding to 20311130503 its reverse (30503111302), we get a palindrome (50814241805).

The spelling of 20311130503 in words is "twenty billion, three hundred eleven million, one hundred thirty thousand, five hundred three".