20720151705 has 16 divisors (see below), whose sum is σ = 36166083264. Its totient is φ = 10046134080.

The previous prime is 20720151607. The next prime is 20720151713. The reversal of 20720151705 is 50715102702.

It is not a de Polignac number, because 20720151705 - 2⁷ = 20720151577 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62788174 + ... + 62788503.

It is an arithmetic number, because the mean of its divisors is an integer number (2260380204).

Almost surely, 2^20720151705 is an apocalyptic number.

It is an amenable number.

20720151705 is a deficient number, since it is larger than the sum of its proper divisors (15445931559).

20720151705 is a wasteful number, since it uses less digits than its factorization.

20720151705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125576696.

The product of its (nonzero) digits is 4900, while the sum is 30.

The spelling of 20720151705 in words is "twenty billion, seven hundred twenty million, one hundred fifty-one thousand, seven hundred five".