20828287 has 8 divisors (see below), whose sum is σ = 21631680. Its totient is φ = 20039040.

The previous prime is 20828279. The next prime is 20828309. The reversal of 20828287 is 78282802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20828287 - 2³ = 20828279 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 (20828257) 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, 487 + ... + 6472.

It is an arithmetic number, because the mean of its divisors is an integer number (2703960).

Almost surely, 2^20828287 is an apocalyptic number.

20828287 is a deficient number, since it is larger than the sum of its proper divisors (803393).

20828287 is an equidigital number, since it uses as much as digits as its factorization.

20828287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7073.

The product of its (nonzero) digits is 28672, while the sum is 37.

The square root of 20828287 is about 4563.8018142772. The cubic root of 20828287 is about 275.1383854464.

It can be divided in two parts, 20828 and 287, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 20828287 in words is "twenty million, eight hundred twenty-eight thousand, two hundred eighty-seven".