20282987 has 16 divisors (see below), whose sum is σ = 21978432. Its totient is φ = 18670080.

The previous prime is 20282963. The next prime is 20283007. The reversal of 20282987 is 78928202.

It is a cyclic number.

It is not a de Polignac number, because 20282987 - 2²⁴ = 3505771 is a prime.

It is a super-2 number, since 2×20282987² = 822799123284338, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20282987.

It is not an unprimeable number, because it can be changed into a prime (20282917) 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, 129113 + ... + 129269.

It is an arithmetic number, because the mean of its divisors is an integer number (1373652).

Almost surely, 2^20282987 is an apocalyptic number.

20282987 is a deficient number, since it is larger than the sum of its proper divisors (1695445).

20282987 is a wasteful number, since it uses less digits than its factorization.

20282987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20282987 is about 4503.6637307863. The cubic root of 20282987 is about 272.7160119829.

The spelling of 20282987 in words is "twenty million, two hundred eighty-two thousand, nine hundred eighty-seven".