20705875 has 16 divisors (see below), whose sum is σ = 26035776. Its totient is φ = 16440000.

The previous prime is 20705869. The next prime is 20705879. The reversal of 20705875 is 57850702.

It is not a de Polignac number, because 20705875 - 2¹⁷ = 20574803 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20705875.

It is not an unprimeable number, because it can be changed into a prime (20705879) 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, 18327 + ... + 19423.

It is an arithmetic number, because the mean of its divisors is an integer number (1627236).

Almost surely, 2^20705875 is an apocalyptic number.

20705875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20705875 is a deficient number, since it is larger than the sum of its proper divisors (5329901).

20705875 is a wasteful number, since it uses less digits than its factorization.

20705875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263 (or 1253 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

The square root of 20705875 is about 4550.3708640066. The cubic root of 20705875 is about 274.5983116171.

The spelling of 20705875 in words is "twenty million, seven hundred five thousand, eight hundred seventy-five".