20389275 has 18 divisors (see below), whose sum is σ = 36519860. Its totient is φ = 10874160.

The previous prime is 20389249. The next prime is 20389297. The reversal of 20389275 is 57298302.

It is a happy number.

20389275 is a `hidden beast` number, since 2 + 0 + 389 + 275 = 666.

It is not a de Polignac number, because 20389275 - 2¹² = 20385179 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 45085 + ... + 45534.

Almost surely, 2^20389275 is an apocalyptic number.

20389275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20389275 is a deficient number, since it is larger than the sum of its proper divisors (16130585).

20389275 is a wasteful number, since it uses less digits than its factorization.

20389275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90635 (or 90627 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 20389275 is about 4515.4484827091. The cubic root of 20389275 is about 273.1915493428.

The spelling of 20389275 in words is "twenty million, three hundred eighty-nine thousand, two hundred seventy-five".