20887475 has 54 divisors (see below), whose sum is σ = 32548140. Its totient is φ = 13251840.

The previous prime is 20887457. The next prime is 20887483. The reversal of 20887475 is 57478802.

It is not a de Polignac number, because 20887475 - 2¹⁰ = 20886451 is a prime.

It is a super-2 number, since 2×20887475² = 872573223751250, which contains 22 as substring.

It is an unprimeable number.

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 53 ways as a sum of consecutive naturals, for example, 353996 + ... + 354054.

Almost surely, 2^20887475 is an apocalyptic number.

20887475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20887475 is a deficient number, since it is larger than the sum of its proper divisors (11660665).

20887475 is a wasteful number, since it uses less digits than its factorization.

20887475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 20887475 is about 4570.2817199818. The cubic root of 20887475 is about 275.3987603460.

The spelling of 20887475 in words is "twenty million, eight hundred eighty-seven thousand, four hundred seventy-five".