20884959 has 40 divisors (see below), whose sum is σ = 34238160. Its totient is φ = 12628224.

The previous prime is 20884951. The next prime is 20885003. The reversal of 20884959 is 95948802.

It is not a de Polignac number, because 20884959 - 2³ = 20884951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20884951) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39672 + ... + 40194.

It is an arithmetic number, because the mean of its divisors is an integer number (855954).

Almost surely, 2^20884959 is an apocalyptic number.

20884959 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20884959 is a deficient number, since it is larger than the sum of its proper divisors (13353201).

20884959 is a wasteful number, since it uses less digits than its factorization.

20884959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 20884959 is about 4570.0064551377. The cubic root of 20884959 is about 275.3877021863.

The spelling of 20884959 in words is "twenty million, eight hundred eighty-four thousand, nine hundred fifty-nine".