20005431497 has 2 divisors, whose sum is σ = 20005431498. Its totient is φ = 20005431496.

The previous prime is 20005431437. The next prime is 20005431503. The reversal of 20005431497 is 79413450002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19549352761 + 456078736 = 139819^2 + 21356^2 .

It is a cyclic number.

It is not a de Polignac number, because 20005431497 - 2¹² = 20005427401 is a prime.

It is a super-2 number, since 2×20005431497² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20005431437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002715748 + 10002715749.

It is an arithmetic number, because the mean of its divisors is an integer number (10002715749).

Almost surely, 2^20005431497 is an apocalyptic number.

It is an amenable number.

20005431497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20005431497 is an equidigital number, since it uses as much as digits as its factorization.

20005431497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 35.

Adding to 20005431497 its reverse (79413450002), we get a palindrome (99418881499).

The spelling of 20005431497 in words is "twenty billion, five million, four hundred thirty-one thousand, four hundred ninety-seven".