20723585871 has 8 divisors (see below), whose sum is σ = 29256827184. Its totient is φ = 13003034240.

The previous prime is 20723585843. The next prime is 20723585887. The reversal of 20723585871 is 17858532702.

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 20723585871 - 2¹¹ = 20723583823 is a prime.

It is a super-2 number, since 2×20723585871² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20723585871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20723585821) 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 7 ways as a sum of consecutive naturals, for example, 203172360 + ... + 203172461.

It is an arithmetic number, because the mean of its divisors is an integer number (3657103398).

Almost surely, 2^20723585871 is an apocalyptic number.

20723585871 is a deficient number, since it is larger than the sum of its proper divisors (8533241313).

20723585871 is a wasteful number, since it uses less digits than its factorization.

20723585871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406344841.

The product of its (nonzero) digits is 940800, while the sum is 48.

The spelling of 20723585871 in words is "twenty billion, seven hundred twenty-three million, five hundred eighty-five thousand, eight hundred seventy-one".