20543140256297 has 2 divisors, whose sum is σ = 20543140256298. Its totient is φ = 20543140256296.

The previous prime is 20543140256213. The next prime is 20543140256333. The reversal of 20543140256297 is 79265204134502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14921138858521 + 5622001397776 = 3862789^2 + 2371076^2 .

It is a cyclic number.

It is not a de Polignac number, because 20543140256297 - 2¹⁰ = 20543140255273 is a prime.

It is a super-2 number, since 2×20543140256297² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20543140256897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10271570128148 + 10271570128149.

It is an arithmetic number, because the mean of its divisors is an integer number (10271570128149).

Almost surely, 2^{20543140256297} is an apocalyptic number.

It is an amenable number.

20543140256297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20543140256297 is an equidigital number, since it uses as much as digits as its factorization.

20543140256297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 20543140256297 in words is "twenty trillion, five hundred forty-three billion, one hundred forty million, two hundred fifty-six thousand, two hundred ninety-seven".