20766243593 has 8 divisors (see below), whose sum is σ = 20820558816. Its totient is φ = 20711984800.

The previous prime is 20766243559. The next prime is 20766243607. The reversal of 20766243593 is 39534266702.

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 20766243593 - 2¹⁰ = 20766242569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20766243503) 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, 780398 + ... + 806568.

It is an arithmetic number, because the mean of its divisors is an integer number (2602569852).

Almost surely, 2^20766243593 is an apocalyptic number.

It is an amenable number.

20766243593 is a deficient number, since it is larger than the sum of its proper divisors (54315223).

20766243593 is a wasteful number, since it uses less digits than its factorization.

20766243593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28215.

The product of its (nonzero) digits is 1632960, while the sum is 47.

The spelling of 20766243593 in words is "twenty billion, seven hundred sixty-six million, two hundred forty-three thousand, five hundred ninety-three".