20404241497 has 2 divisors, whose sum is σ = 20404241498. Its totient is φ = 20404241496.

The previous prime is 20404241467. The next prime is 20404241521. The reversal of 20404241497 is 79414240402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20104120521 + 300120976 = 141789^2 + 17324^2 .

It is a cyclic number.

It is not a de Polignac number, because 20404241497 - 2⁷ = 20404241369 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404241437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202120748 + 10202120749.

It is an arithmetic number, because the mean of its divisors is an integer number (10202120749).

Almost surely, 2^20404241497 is an apocalyptic number.

It is an amenable number.

20404241497 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404241497 is an equidigital number, since it uses as much as digits as its factorization.

20404241497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 37.

Adding to 20404241497 its reverse (79414240402), we get a palindrome (99818481899).

The spelling of 20404241497 in words is "twenty billion, four hundred four million, two hundred forty-one thousand, four hundred ninety-seven".