20805375 has 32 divisors (see below), whose sum is σ = 35006400. Its totient is φ = 10972800.

The previous prime is 20805373. The next prime is 20805377. The reversal of 20805375 is 57350802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20805373) and next prime (20805377).

It is not a de Polignac number, because 20805375 - 2¹ = 20805373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20805373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40621 + ... + 41129.

It is an arithmetic number, because the mean of its divisors is an integer number (1093950).

Almost surely, 2^20805375 is an apocalyptic number.

20805375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20805375 is a deficient number, since it is larger than the sum of its proper divisors (14201025).

20805375 is a wasteful number, since it uses less digits than its factorization.

20805375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20805375 is about 4561.2909356891. The cubic root of 20805375 is about 275.0374604616.

The spelling of 20805375 in words is "twenty million, eight hundred five thousand, three hundred seventy-five".