20144503426781 has 2 divisors, whose sum is σ = 20144503426782. Its totient is φ = 20144503426780.

The previous prime is 20144503426763. The next prime is 20144503426799. The reversal of 20144503426781 is 18762430544102.

It is a balanced prime because it is at equal distance from previous prime (20144503426763) and next prime (20144503426799).

It can be written as a sum of positive squares in only one way, i.e., 19397418062500 + 747085364281 = 4404250^2 + 864341^2 .

It is a cyclic number.

It is not a de Polignac number, because 20144503426781 - 2¹⁰ = 20144503425757 is a prime.

It is a super-2 number, since 2×20144503426781² (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 (20144503422781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072251713390 + 10072251713391.

It is an arithmetic number, because the mean of its divisors is an integer number (10072251713391).

Almost surely, 2^{20144503426781} is an apocalyptic number.

It is an amenable number.

20144503426781 is a deficient number, since it is larger than the sum of its proper divisors (1).

20144503426781 is an equidigital number, since it uses as much as digits as its factorization.

20144503426781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 20144503426781 in words is "twenty trillion, one hundred forty-four billion, five hundred three million, four hundred twenty-six thousand, seven hundred eighty-one".