20983575 has 24 divisors (see below), whose sum is σ = 34981888. Its totient is φ = 11098080.

The previous prime is 20983561. The next prime is 20983583. The reversal of 20983575 is 57538902.

It is not a de Polignac number, because 20983575 - 2¹⁶ = 20918039 is a prime.

It is a Duffinian number.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 8424 + ... + 10626.

Almost surely, 2^20983575 is an apocalyptic number.

20983575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20983575 is a deficient number, since it is larger than the sum of its proper divisors (13998313).

20983575 is a wasteful number, since it uses less digits than its factorization.

20983575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343 (or 2338 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 20983575 is about 4580.7832299728. The cubic root of 20983575 is about 275.8204697824.

The spelling of 20983575 in words is "twenty million, nine hundred eighty-three thousand, five hundred seventy-five".