20706875 has 20 divisors (see below), whose sum is σ = 29578032. Its totient is φ = 14196000.

The previous prime is 20706871. The next prime is 20706929. The reversal of 20706875 is 57860702.

It is not a de Polignac number, because 20706875 - 2² = 20706871 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20706871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2009 + ... + 6741.

Almost surely, 2^20706875 is an apocalyptic number.

20706875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20706875 is a deficient number, since it is larger than the sum of its proper divisors (8871157).

20706875 is an frugal number, since it uses more digits than its factorization.

20706875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4760 (or 4745 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 20706875 is about 4550.4807438336. The cubic root of 20706875 is about 274.6027321643.

The spelling of 20706875 in words is "twenty million, seven hundred six thousand, eight hundred seventy-five".