20828887 has 4 divisors (see below), whose sum is σ = 20838040. Its totient is φ = 20819736.

The previous prime is 20828879. The next prime is 20828897. The reversal of 20828887 is 78882802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20828887 - 2³ = 20828879 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 (20828827) 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, 1789 + ... + 6697.

It is an arithmetic number, because the mean of its divisors is an integer number (5209510).

Almost surely, 2^20828887 is an apocalyptic number.

20828887 is a deficient number, since it is larger than the sum of its proper divisors (9153).

20828887 is an equidigital number, since it uses as much as digits as its factorization.

20828887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9152.

The product of its (nonzero) digits is 114688, while the sum is 43.

The square root of 20828887 is about 4563.8675484725. The cubic root of 20828887 is about 275.1410273895.

The spelling of 20828887 in words is "twenty million, eight hundred twenty-eight thousand, eight hundred eighty-seven".