20858964 has 48 divisors (see below), whose sum is σ = 55910400. Its totient is φ = 5929056.

The previous prime is 20858927. The next prime is 20858969. The reversal of 20858964 is 46985802.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20858969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19557 + ... + 20595.

It is an arithmetic number, because the mean of its divisors is an integer number (1164800).

Almost surely, 2^20858964 is an apocalyptic number.

It is an amenable number.

20858964 is an abundant number, since it is smaller than the sum of its proper divisors (35051436).

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

20858964 is a wasteful number, since it uses less digits than its factorization.

20858964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292 (or 1290 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 20858964 is about 4567.1614817083. The cubic root of 20858964 is about 275.2733986268.

The spelling of 20858964 in words is "twenty million, eight hundred fifty-eight thousand, nine hundred sixty-four".