20724368766433 has 2 divisors, whose sum is σ = 20724368766434. Its totient is φ = 20724368766432.

The previous prime is 20724368766391. The next prime is 20724368766461. The reversal of 20724368766433 is 33466786342702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11912210279649 + 8812158486784 = 3451407^2 + 2968528^2 .

It is a cyclic number.

It is not a de Polignac number, because 20724368766433 - 2¹³ = 20724368758241 is a prime.

It is a super-2 number, since 2×20724368766433² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20724368766463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362184383216 + 10362184383217.

It is an arithmetic number, because the mean of its divisors is an integer number (10362184383217).

Almost surely, 2^{20724368766433} is an apocalyptic number.

It is an amenable number.

20724368766433 is a deficient number, since it is larger than the sum of its proper divisors (1).

20724368766433 is an equidigital number, since it uses as much as digits as its factorization.

20724368766433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 146313216, while the sum is 61.

The spelling of 20724368766433 in words is "twenty trillion, seven hundred twenty-four billion, three hundred sixty-eight million, seven hundred sixty-six thousand, four hundred thirty-three".