20440342424981 has 2 divisors, whose sum is σ = 20440342424982. Its totient is φ = 20440342424980.

The previous prime is 20440342424977. The next prime is 20440342425053. The reversal of 20440342424981 is 18942424304402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20361979380625 + 78363044356 = 4512425^2 + 279934^2 .

It is a cyclic number.

It is not a de Polignac number, because 20440342424981 - 2² = 20440342424977 is a prime.

It is a super-2 number, since 2×20440342424981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20440342424951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220171212490 + 10220171212491.

It is an arithmetic number, because the mean of its divisors is an integer number (10220171212491).

Almost surely, 2^{20440342424981} is an apocalyptic number.

It is an amenable number.

20440342424981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20440342424981 is an equidigital number, since it uses as much as digits as its factorization.

20440342424981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1769472, while the sum is 47.

The spelling of 20440342424981 in words is "twenty trillion, four hundred forty billion, three hundred forty-two million, four hundred twenty-four thousand, nine hundred eighty-one".