20312143057 has 2 divisors, whose sum is σ = 20312143058. Its totient is φ = 20312143056.

The previous prime is 20312143003. The next prime is 20312143081. The reversal of 20312143057 is 75034121302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20231933121 + 80209936 = 142239^2 + 8956^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312143057 - 2¹¹ = 20312141009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20312143457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156071528 + 10156071529.

It is an arithmetic number, because the mean of its divisors is an integer number (10156071529).

Almost surely, 2^20312143057 is an apocalyptic number.

It is an amenable number.

20312143057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312143057 is an equidigital number, since it uses as much as digits as its factorization.

20312143057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

Adding to 20312143057 its reverse (75034121302), we get a palindrome (95346264359).

The spelling of 20312143057 in words is "twenty billion, three hundred twelve million, one hundred forty-three thousand, fifty-seven".