20825887 has 4 divisors (see below), whose sum is σ = 20838880. Its totient is φ = 20812896.

The previous prime is 20825869. The next prime is 20825891. The reversal of 20825887 is 78852802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20825887 - 2¹¹ = 20823839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20825807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3687 + ... + 7432.

It is an arithmetic number, because the mean of its divisors is an integer number (5209720).

Almost surely, 2^20825887 is an apocalyptic number.

20825887 is a deficient number, since it is larger than the sum of its proper divisors (12993).

20825887 is a wasteful number, since it uses less digits than its factorization.

20825887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12992.

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 20825887 is about 4563.5388680278. The cubic root of 20825887 is about 275.1278171667.

It can be divided in two parts, 20825 and 887, that added together give a palindrome (21712).

The spelling of 20825887 in words is "twenty million, eight hundred twenty-five thousand, eight hundred eighty-seven".