20764813665433 has 8 divisors (see below), whose sum is σ = 20839937417480. Its totient is φ = 20689691068800.

The previous prime is 20764813665391. The next prime is 20764813665437. The reversal of 20764813665433 is 33456631846702.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1289423838784 + 19475389826649 = 1135528^2 + 4413093^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20764813665433 - 2¹³ = 20764813657241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20764813665437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54406813 + ... + 54787141.

It is an arithmetic number, because the mean of its divisors is an integer number (2604992177185).

Almost surely, 2^{20764813665433} is an apocalyptic number.

It is an amenable number.

20764813665433 is a deficient number, since it is larger than the sum of its proper divisors (75123752047).

20764813665433 is a wasteful number, since it uses less digits than its factorization.

20764813665433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577707.

The product of its (nonzero) digits is 52254720, while the sum is 58.

The spelling of 20764813665433 in words is "twenty trillion, seven hundred sixty-four billion, eight hundred thirteen million, six hundred sixty-five thousand, four hundred thirty-three".