20389775 has 48 divisors (see below), whose sum is σ = 30759936. Its totient is φ = 13115520.

The previous prime is 20389763. The next prime is 20389801. The reversal of 20389775 is 57798302.

It is not a de Polignac number, because 20389775 - 2¹⁴ = 20373391 is a prime.

It is a Duffinian number.

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, 304292 + ... + 304358.

It is an arithmetic number, because the mean of its divisors is an integer number (640832).

Almost surely, 2^20389775 is an apocalyptic number.

20389775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20389775 is a deficient number, since it is larger than the sum of its proper divisors (10370161).

20389775 is a wasteful number, since it uses less digits than its factorization.

20389775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 20389775 is about 4515.5038478557. The cubic root of 20389775 is about 273.1937824557.

The spelling of 20389775 in words is "twenty million, three hundred eighty-nine thousand, seven hundred seventy-five".