20959500 has 96 divisors (see below), whose sum is σ = 62112960. Its totient is φ = 5491200.

The previous prime is 20959483. The next prime is 20959511. The reversal of 20959500 is 595902.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 133422 + ... + 133578.

It is an arithmetic number, because the mean of its divisors is an integer number (647010).

Almost surely, 2^20959500 is an apocalyptic number.

20959500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20959500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31056480).

20959500 is an abundant number, since it is smaller than the sum of its proper divisors (41153460).

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

20959500 is a wasteful number, since it uses less digits than its factorization.

20959500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 4050, while the sum is 30.

The square root of 20959500 is about 4578.1546500746. The cubic root of 20959500 is about 275.7149440877.

The spelling of 20959500 in words is "twenty million, nine hundred fifty-nine thousand, five hundred".