20311120553 has 2 divisors, whose sum is σ = 20311120554. Its totient is φ = 20311120552.

The previous prime is 20311120537. The next prime is 20311120561. The reversal of 20311120553 is 35502111302.

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., 17464151104 + 2846969449 = 132152^2 + 53357^2 .

It is a cyclic number.

It is not a de Polignac number, because 20311120553 - 2⁴ = 20311120537 is a prime.

It is not a weakly prime, because it can be changed into another prime (20311320553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155560276 + 10155560277.

It is an arithmetic number, because the mean of its divisors is an integer number (10155560277).

Almost surely, 2^20311120553 is an apocalyptic number.

It is an amenable number.

20311120553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20311120553 is an equidigital number, since it uses as much as digits as its factorization.

20311120553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 20311120553 its reverse (35502111302), we get a palindrome (55813231855).

The spelling of 20311120553 in words is "twenty billion, three hundred eleven million, one hundred twenty thousand, five hundred fifty-three".