20440131197 has 2 divisors, whose sum is σ = 20440131198. Its totient is φ = 20440131196.

The previous prime is 20440131121. The next prime is 20440131247. The reversal of 20440131197 is 79113104402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19954105081 + 486026116 = 141259^2 + 22046^2 .

It is a cyclic number.

It is not a de Polignac number, because 20440131197 - 2¹⁸ = 20439869053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20440139197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220065598 + 10220065599.

It is an arithmetic number, because the mean of its divisors is an integer number (10220065599).

Almost surely, 2^20440131197 is an apocalyptic number.

It is an amenable number.

20440131197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440131197 is an equidigital number, since it uses as much as digits as its factorization.

20440131197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 32.

Adding to 20440131197 its reverse (79113104402), we get a palindrome (99553235599).

The spelling of 20440131197 in words is "twenty billion, four hundred forty million, one hundred thirty-one thousand, one hundred ninety-seven".