20717868670 has 32 divisors (see below), whose sum is σ = 38337890976. Its totient is φ = 8056204800.

The previous prime is 20717868667. The next prime is 20717868671. The reversal of 20717868670 is 7686871702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717868671) 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 15 ways as a sum of consecutive naturals, for example, 25297 + ... + 205123.

It is an arithmetic number, because the mean of its divisors is an integer number (1198059093).

Almost surely, 2^20717868670 is an apocalyptic number.

20717868670 is a deficient number, since it is larger than the sum of its proper divisors (17620022306).

20717868670 is a wasteful number, since it uses less digits than its factorization.

20717868670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180156.

The product of its (nonzero) digits is 1580544, while the sum is 52.

The spelling of 20717868670 in words is "twenty billion, seven hundred seventeen million, eight hundred sixty-eight thousand, six hundred seventy".