20712495481 has 2 divisors, whose sum is σ = 20712495482. Its totient is φ = 20712495480.

The previous prime is 20712495469. The next prime is 20712495499. The reversal of 20712495481 is 18459421702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20711527225 + 968256 = 143915^2 + 984^2 .

It is a cyclic number.

It is not a de Polignac number, because 20712495481 - 2¹¹ = 20712493433 is a prime.

It is a super-2 number, since 2×20712495481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20712495421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10356247740 + 10356247741.

It is an arithmetic number, because the mean of its divisors is an integer number (10356247741).

Almost surely, 2^20712495481 is an apocalyptic number.

It is an amenable number.

20712495481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20712495481 is an equidigital number, since it uses as much as digits as its factorization.

20712495481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 43.

The spelling of 20712495481 in words is "twenty billion, seven hundred twelve million, four hundred ninety-five thousand, four hundred eighty-one".