20715239881 has 8 divisors (see below), whose sum is σ = 23716615104. Its totient is φ = 17724378480.

The previous prime is 20715239861. The next prime is 20715239887. The reversal of 20715239881 is 18893251702.

It is a happy number.

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 20715239881 - 2¹³ = 20715231689 is a prime.

It is a super-2 number, since 2×20715239881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20715239887) 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, 2624230 + ... + 2632111.

It is an arithmetic number, because the mean of its divisors is an integer number (2964576888).

Almost surely, 2^20715239881 is an apocalyptic number.

It is an amenable number.

20715239881 is a deficient number, since it is larger than the sum of its proper divisors (3001375223).

20715239881 is an equidigital number, since it uses as much as digits as its factorization.

20715239881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256911.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 20715239881 in words is "twenty billion, seven hundred fifteen million, two hundred thirty-nine thousand, eight hundred eighty-one".