20743620685 has 8 divisors (see below), whose sum is σ = 25750701720. Its totient is φ = 16022658624.

The previous prime is 20743620649. The next prime is 20743620701. The reversal of 20743620685 is 58602634702.

It can be written as a sum of positive squares in 4 ways, for example, as 65755881 + 20677864804 = 8109^2 + 143798^2 .

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 20743620685 - 2¹³ = 20743612493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71529582 + ... + 71529871.

It is an arithmetic number, because the mean of its divisors is an integer number (3218837715).

Almost surely, 2^20743620685 is an apocalyptic number.

It is an amenable number.

20743620685 is a deficient number, since it is larger than the sum of its proper divisors (5007081035).

20743620685 is a wasteful number, since it uses less digits than its factorization.

20743620685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143059487.

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 20743620685 in words is "twenty billion, seven hundred forty-three million, six hundred twenty thousand, six hundred eighty-five".