20666475 has 48 divisors (see below), whose sum is σ = 40220640. Its totient is φ = 10368000.

The previous prime is 20666453. The next prime is 20666521. The reversal of 20666475 is 57466602.

It is not a de Polignac number, because 20666475 - 2⁹ = 20665963 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10575 + ... + 12375.

It is an arithmetic number, because the mean of its divisors is an integer number (837930).

Almost surely, 2^20666475 is an apocalyptic number.

20666475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20666475 is a deficient number, since it is larger than the sum of its proper divisors (19554165).

20666475 is a wasteful number, since it uses less digits than its factorization.

20666475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837 (or 1826 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 20666475 is about 4546.0394850903. The cubic root of 20666475 is about 274.4240286639.

The spelling of 20666475 in words is "twenty million, six hundred sixty-six thousand, four hundred seventy-five".