20717868669 has 8 divisors (see below), whose sum is σ = 29248755840. Its totient is φ = 12999446976.

The previous prime is 20717868667. The next prime is 20717868671. The reversal of 20717868669 is 96686871702.

It is an interprime number because it is at equal distance from previous prime (20717868667) and next prime (20717868671).

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

It is not a de Polignac number, because 20717868669 - 2¹ = 20717868667 is a prime.

It is a super-2 number, since 2×20717868669² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717868667) 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, 203116309 + ... + 203116410.

It is an arithmetic number, because the mean of its divisors is an integer number (3656094480).

Almost surely, 2^20717868669 is an apocalyptic number.

It is an amenable number.

20717868669 is a deficient number, since it is larger than the sum of its proper divisors (8530887171).

20717868669 is a wasteful number, since it uses less digits than its factorization.

20717868669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406232739.

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 20717868669 in words is "twenty billion, seven hundred seventeen million, eight hundred sixty-eight thousand, six hundred sixty-nine".