20287375 has 16 divisors (see below), whose sum is σ = 26810784. Its totient is φ = 15273600.

The previous prime is 20287373. The next prime is 20287391. The reversal of 20287375 is 57378202.

It is not a de Polignac number, because 20287375 - 2¹ = 20287373 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20287375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287373) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2649 + ... + 6898.

It is an arithmetic number, because the mean of its divisors is an integer number (1675674).

Almost surely, 2^20287375 is an apocalyptic number.

20287375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20287375 is a deficient number, since it is larger than the sum of its proper divisors (6523409).

20287375 is an equidigital number, since it uses as much as digits as its factorization.

20287375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9579 (or 9569 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 20287375 is about 4504.1508633704. The cubic root of 20287375 is about 272.7356769296.

The spelling of 20287375 in words is "twenty million, two hundred eighty-seven thousand, three hundred seventy-five".