20355312013481 has 2 divisors, whose sum is σ = 20355312013482. Its totient is φ = 20355312013480.

The previous prime is 20355312013429. The next prime is 20355312013501. The reversal of 20355312013481 is 18431021355302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18271273309081 + 2084038704400 = 4274491^2 + 1443620^2 .

It is a cyclic number.

It is not a de Polignac number, because 20355312013481 - 2⁴² = 15957265502377 is a prime.

It is a super-2 number, since 2×20355312013481² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20355312013381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177656006740 + 10177656006741.

It is an arithmetic number, because the mean of its divisors is an integer number (10177656006741).

Almost surely, 2^{20355312013481} is an apocalyptic number.

It is an amenable number.

20355312013481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20355312013481 is an equidigital number, since it uses as much as digits as its factorization.

20355312013481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 20355312013481 its reverse (18431021355302), we get a palindrome (38786333368783).

The spelling of 20355312013481 in words is "twenty trillion, three hundred fifty-five billion, three hundred twelve million, thirteen thousand, four hundred eighty-one".