20887000 has 32 divisors (see below), whose sum is σ = 48877920. Its totient is φ = 8354400.

The previous prime is 20886991. The next prime is 20887001. The reversal of 20887000 is 78802.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20887001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9444 + ... + 11443.

It is an arithmetic number, because the mean of its divisors is an integer number (1527435).

Almost surely, 2^20887000 is an apocalyptic number.

20887000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20887000 is an abundant number, since it is smaller than the sum of its proper divisors (27990920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20887000 is a wasteful number, since it uses less digits than its factorization.

20887000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20908 (or 20894 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 20887000 is about 4570.2297535244. The cubic root of 20887000 is about 275.3966727249.

The spelling of 20887000 in words is "twenty million, eight hundred eighty-seven thousand".