20310146557 has 2 divisors, whose sum is σ = 20310146558. Its totient is φ = 20310146556.

The previous prime is 20310146533. The next prime is 20310146569. The reversal of 20310146557 is 75564101302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12327438841 + 7982707716 = 111029^2 + 89346^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20310146557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20310141557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155073278 + 10155073279.

It is an arithmetic number, because the mean of its divisors is an integer number (10155073279).

Almost surely, 2^20310146557 is an apocalyptic number.

It is an amenable number.

20310146557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310146557 is an equidigital number, since it uses as much as digits as its factorization.

20310146557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 34.

Adding to 20310146557 its reverse (75564101302), we get a palindrome (95874247859).

The spelling of 20310146557 in words is "twenty billion, three hundred ten million, one hundred forty-six thousand, five hundred fifty-seven".