20858484 has 12 divisors (see below), whose sum is σ = 48669824. Its totient is φ = 6952824.

The previous prime is 20858477. The next prime is 20858489. The reversal of 20858484 is 48485802.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 869092 + ... + 869115.

Almost surely, 2^20858484 is an apocalyptic number.

It is an amenable number.

20858484 is an abundant number, since it is smaller than the sum of its proper divisors (27811340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20858484 is a wasteful number, since it uses less digits than its factorization.

20858484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1738214 (or 1738212 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 39.

The square root of 20858484 is about 4567.1089323553. The cubic root of 20858484 is about 275.2712871086.

The spelling of 20858484 in words is "twenty million, eight hundred fifty-eight thousand, four hundred eighty-four".