20766740293 has 4 divisors (see below), whose sum is σ = 22364181868. Its totient is φ = 19169298720.

The previous prime is 20766740279. The next prime is 20766740341. The reversal of 20766740293 is 39204766702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10808097444 + 9958642849 = 103962^2 + 99793^2 .

It is not a de Polignac number, because 20766740293 - 2⁵ = 20766740261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766740893) 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 in 3 ways as a sum of consecutive naturals, for example, 798720768 + ... + 798720793.

It is an arithmetic number, because the mean of its divisors is an integer number (5591045467).

Almost surely, 2^20766740293 is an apocalyptic number.

It is an amenable number.

20766740293 is a deficient number, since it is larger than the sum of its proper divisors (1597441575).

20766740293 is a wasteful number, since it uses less digits than its factorization.

20766740293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597441574.

The product of its (nonzero) digits is 762048, while the sum is 46.

The spelling of 20766740293 in words is "twenty billion, seven hundred sixty-six million, seven hundred forty thousand, two hundred ninety-three".