20955705 has 16 divisors (see below), whose sum is σ = 33633600. Its totient is φ = 11141568.

The previous prime is 20955667. The next prime is 20955707. The reversal of 20955705 is 50755902.

It is not a de Polignac number, because 20955705 - 2¹⁷ = 20824633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20955707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3234 + ... + 7236.

It is an arithmetic number, because the mean of its divisors is an integer number (2102100).

Almost surely, 2^20955705 is an apocalyptic number.

It is an amenable number.

20955705 is a deficient number, since it is larger than the sum of its proper divisors (12677895).

20955705 is a wasteful number, since it uses less digits than its factorization.

20955705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4360.

The product of its (nonzero) digits is 15750, while the sum is 33.

The square root of 20955705 is about 4577.7401630062. The cubic root of 20955705 is about 275.6983024475.

The spelling of 20955705 in words is "twenty million, nine hundred fifty-five thousand, seven hundred five".