20320288553 has 2 divisors, whose sum is σ = 20320288554. Its totient is φ = 20320288552.

The previous prime is 20320288531. The next prime is 20320288577. The reversal of 20320288553 is 35588202302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15382696729 + 4937591824 = 124027^2 + 70268^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320288553 - 2²⁴ = 20303511337 is a prime.

It is not a weakly prime, because it can be changed into another prime (20320288453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160144276 + 10160144277.

It is an arithmetic number, because the mean of its divisors is an integer number (10160144277).

Almost surely, 2^20320288553 is an apocalyptic number.

It is an amenable number.

20320288553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320288553 is an equidigital number, since it uses as much as digits as its factorization.

20320288553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 20320288553 in words is "twenty billion, three hundred twenty million, two hundred eighty-eight thousand, five hundred fifty-three".