20875505 has 32 divisors (see below), whose sum is σ = 30032640. Its totient is φ = 13628160.

The previous prime is 20875483. The next prime is 20875523. The reversal of 20875505 is 50557802.

It is a happy number.

It is not a de Polignac number, because 20875505 - 2⁶ = 20875441 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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132887 + ... + 133043.

It is an arithmetic number, because the mean of its divisors is an integer number (938520).

Almost surely, 2^20875505 is an apocalyptic number.

It is an amenable number.

20875505 is a deficient number, since it is larger than the sum of its proper divisors (9157135).

20875505 is a wasteful number, since it uses less digits than its factorization.

20875505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329.

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 20875505 is about 4568.9719850312. The cubic root of 20875505 is about 275.3461426397.

The spelling of 20875505 in words is "twenty million, eight hundred seventy-five thousand, five hundred five".