20520340097 has 2 divisors, whose sum is σ = 20520340098. Its totient is φ = 20520340096.

The previous prime is 20520340069. The next prime is 20520340103. The reversal of 20520340097 is 79004302502.

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., 12812202481 + 7708137616 = 113191^2 + 87796^2 .

It is a cyclic number.

It is not a de Polignac number, because 20520340097 - 2¹⁶ = 20520274561 is a prime.

It is not a weakly prime, because it can be changed into another prime (20520342097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10260170048 + 10260170049.

It is an arithmetic number, because the mean of its divisors is an integer number (10260170049).

Almost surely, 2^20520340097 is an apocalyptic number.

It is an amenable number.

20520340097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20520340097 is an equidigital number, since it uses as much as digits as its factorization.

20520340097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

Adding to 20520340097 its reverse (79004302502), we get a palindrome (99524642599).

The spelling of 20520340097 in words is "twenty billion, five hundred twenty million, three hundred forty thousand, ninety-seven".