20736744747 has 8 divisors (see below), whose sum is σ = 27655699344. Its totient is φ = 13821143328.

The previous prime is 20736744709. The next prime is 20736744779. The reversal of 20736744747 is 74744763702.

It is a happy number.

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

It is not a de Polignac number, because 20736744747 - 2¹⁸ = 20736482603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20736744747.

It is not an unprimeable number, because it can be changed into a prime (20736724747) 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, 823828 + ... + 848625.

It is an arithmetic number, because the mean of its divisors is an integer number (3456962418).

Almost surely, 2^20736744747 is an apocalyptic number.

20736744747 is a deficient number, since it is larger than the sum of its proper divisors (6918954597).

20736744747 is a wasteful number, since it uses less digits than its factorization.

20736744747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1676589.

The product of its (nonzero) digits is 5531904, while the sum is 51.

The spelling of 20736744747 in words is "twenty billion, seven hundred thirty-six million, seven hundred forty-four thousand, seven hundred forty-seven".