20552511481 has 2 divisors, whose sum is σ = 20552511482. Its totient is φ = 20552511480.

The previous prime is 20552511479. The next prime is 20552511493. The reversal of 20552511481 is 18411525502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17726525881 + 2825985600 = 133141^2 + 53160^2 .

It is a cyclic number.

It is not a de Polignac number, because 20552511481 - 2¹ = 20552511479 is a prime.

It is a super-2 number, since 2×20552511481² (a number of 21 digits) contains 22 as substring.

Together with 20552511479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20552511431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10276255740 + 10276255741.

It is an arithmetic number, because the mean of its divisors is an integer number (10276255741).

Almost surely, 2^20552511481 is an apocalyptic number.

It is an amenable number.

20552511481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20552511481 is an equidigital number, since it uses as much as digits as its factorization.

20552511481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16000, while the sum is 34.

The spelling of 20552511481 in words is "twenty billion, five hundred fifty-two million, five hundred eleven thousand, four hundred eighty-one".