20995475 has 12 divisors (see below), whose sum is σ = 27405240. Its totient is φ = 15912000.

The previous prime is 20995439. The next prime is 20995489. The reversal of 20995475 is 57459902.

It is not a de Polignac number, because 20995475 - 2⁶ = 20995411 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21626 + ... + 22575.

It is an arithmetic number, because the mean of its divisors is an integer number (2283770).

Almost surely, 2^20995475 is an apocalyptic number.

20995475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20995475 is a deficient number, since it is larger than the sum of its proper divisors (6409765).

20995475 is a wasteful number, since it uses less digits than its factorization.

20995475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44230 (or 44225 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 20995475 is about 4582.0819503802. The cubic root of 20995475 is about 275.8726001323.

The spelling of 20995475 in words is "twenty million, nine hundred ninety-five thousand, four hundred seventy-five".