20824603463681 has 2 divisors, whose sum is σ = 20824603463682. Its totient is φ = 20824603463680.

The previous prime is 20824603463663. The next prime is 20824603463687. The reversal of 20824603463681 is 18636430642802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16102435430656 + 4722168033025 = 4012784^2 + 2173055^2 .

It is a cyclic number.

It is not a de Polignac number, because 20824603463681 - 2²² = 20824599269377 is a prime.

It is a super-2 number, since 2×20824603463681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20824603463687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10412301731840 + 10412301731841.

It is an arithmetic number, because the mean of its divisors is an integer number (10412301731841).

Almost surely, 2^{20824603463681} is an apocalyptic number.

It is an amenable number.

20824603463681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20824603463681 is an equidigital number, since it uses as much as digits as its factorization.

20824603463681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7962624, while the sum is 53.

The spelling of 20824603463681 in words is "twenty trillion, eight hundred twenty-four billion, six hundred three million, four hundred sixty-three thousand, six hundred eighty-one".