20434097681 has 2 divisors, whose sum is σ = 20434097682. Its totient is φ = 20434097680.

The previous prime is 20434097657. The next prime is 20434097693. The reversal of 20434097681 is 18679043402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18834817600 + 1599280081 = 137240^2 + 39991^2 .

It is a cyclic number.

It is not a de Polignac number, because 20434097681 - 2⁶ = 20434097617 is a prime.

It is a super-2 number, since 2×20434097681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20434097611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10217048840 + 10217048841.

It is an arithmetic number, because the mean of its divisors is an integer number (10217048841).

Almost surely, 2^20434097681 is an apocalyptic number.

It is an amenable number.

20434097681 is a deficient number, since it is larger than the sum of its proper divisors (1).

20434097681 is an equidigital number, since it uses as much as digits as its factorization.

20434097681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 20434097681 in words is "twenty billion, four hundred thirty-four million, ninety-seven thousand, six hundred eighty-one".