20887875 has 40 divisors (see below), whose sum is σ = 38960064. Its totient is φ = 11134800.

The previous prime is 20887873. The next prime is 20887877. The reversal of 20887875 is 57878802.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20887873) and next prime (20887877).

It is not a de Polignac number, because 20887875 - 2¹ = 20887873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20887875.

It is not an unprimeable number, because it can be changed into a prime (20887871) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9094 + ... + 11156.

Almost surely, 2^20887875 is an apocalyptic number.

20887875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20887875 is a deficient number, since it is larger than the sum of its proper divisors (18072189).

20887875 is an equidigital number, since it uses as much as digits as its factorization.

20887875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090 (or 2071 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 45.

The square root of 20887875 is about 4570.3254807508. The cubic root of 20887875 is about 275.4005183182.

The spelling of 20887875 in words is "twenty million, eight hundred eighty-seven thousand, eight hundred seventy-five".