20729142705 has 8 divisors (see below), whose sum is σ = 33166628352. Its totient is φ = 11055542768.

The previous prime is 20729142677. The next prime is 20729142719. The reversal of 20729142705 is 50724192702.

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 20729142705 - 2⁵ = 20729142673 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 690971409 + ... + 690971438.

It is an arithmetic number, because the mean of its divisors is an integer number (4145828544).

Almost surely, 2^20729142705 is an apocalyptic number.

It is an amenable number.

20729142705 is a deficient number, since it is larger than the sum of its proper divisors (12437485647).

20729142705 is a wasteful number, since it uses less digits than its factorization.

20729142705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381942855.

The product of its (nonzero) digits is 70560, while the sum is 39.

The spelling of 20729142705 in words is "twenty billion, seven hundred twenty-nine million, one hundred forty-two thousand, seven hundred five".