20087975 has 6 divisors (see below), whose sum is σ = 24909120. Its totient is φ = 16070360.

The previous prime is 20087953. The next prime is 20087989. The reversal of 20087975 is 57978002.

It is not a de Polignac number, because 20087975 - 2¹⁰ = 20086951 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 401735 + ... + 401784.

It is an arithmetic number, because the mean of its divisors is an integer number (4151520).

Almost surely, 2^20087975 is an apocalyptic number.

20087975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20087975 is a deficient number, since it is larger than the sum of its proper divisors (4821145).

20087975 is an equidigital number, since it uses as much as digits as its factorization.

20087975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803529 (or 803524 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 20087975 is about 4481.9610663191. The cubic root of 20087975 is about 271.8391809948.

The spelling of 20087975 in words is "twenty million, eighty-seven thousand, nine hundred seventy-five".