20022131257 has 2 divisors, whose sum is σ = 20022131258. Its totient is φ = 20022131256.

The previous prime is 20022131179. The next prime is 20022131333. The reversal of 20022131257 is 75213122002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10343703616 + 9678427641 = 101704^2 + 98379^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022131257 - 2¹¹ = 20022129209 is a prime.

It is not a weakly prime, because it can be changed into another prime (20022131057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011065628 + 10011065629.

It is an arithmetic number, because the mean of its divisors is an integer number (10011065629).

Almost surely, 2^20022131257 is an apocalyptic number.

It is an amenable number.

20022131257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20022131257 is an equidigital number, since it uses as much as digits as its factorization.

20022131257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

Adding to 20022131257 its reverse (75213122002), we get a palindrome (95235253259).

The spelling of 20022131257 in words is "twenty billion, twenty-two million, one hundred thirty-one thousand, two hundred fifty-seven".