20553343297 has 2 divisors, whose sum is σ = 20553343298. Its totient is φ = 20553343296.

The previous prime is 20553343277. The next prime is 20553343303. The reversal of 20553343297 is 79234335502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20040366096 + 512977201 = 141564^2 + 22649^2 .

It is a cyclic number.

It is not a de Polignac number, because 20553343297 - 2⁷ = 20553343169 is a prime.

It is not a weakly prime, because it can be changed into another prime (20553343277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276671648 + 10276671649.

It is an arithmetic number, because the mean of its divisors is an integer number (10276671649).

Almost surely, 2^20553343297 is an apocalyptic number.

It is an amenable number.

20553343297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20553343297 is an equidigital number, since it uses as much as digits as its factorization.

20553343297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 680400, while the sum is 43.

Adding to 20553343297 its reverse (79234335502), we get a palindrome (99787678799).

The spelling of 20553343297 in words is "twenty billion, five hundred fifty-three million, three hundred forty-three thousand, two hundred ninety-seven".