20876885 has 4 divisors (see below), whose sum is σ = 25052268. Its totient is φ = 16701504.

The previous prime is 20876861. The next prime is 20876899. The reversal of 20876885 is 58867802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12103441 + 8773444 = 3479^2 + 2962^2 .

It is a cyclic number.

It is not a de Polignac number, because 20876885 - 2¹⁰ = 20875861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087684 + ... + 2087693.

It is an arithmetic number, because the mean of its divisors is an integer number (6263067).

Almost surely, 2^20876885 is an apocalyptic number.

It is an amenable number.

20876885 is a deficient number, since it is larger than the sum of its proper divisors (4175383).

20876885 is an equidigital number, since it uses as much as digits as its factorization.

20876885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4175382.

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 20876885 is about 4569.1230011896. The cubic root of 20876885 is about 275.3522098670.

The spelling of 20876885 in words is "twenty million, eight hundred seventy-six thousand, eight hundred eighty-five".