20001500 has 48 divisors (see below), whose sum is σ = 44204160. Its totient is φ = 7905600.

The previous prime is 20001491. The next prime is 20001517. The reversal of 20001500 is 510002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54317 + ... + 54683.

It is an arithmetic number, because the mean of its divisors is an integer number (920920).

Almost surely, 2^20001500 is an apocalyptic number.

20001500 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 20001500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22102080).

20001500 is an abundant number, since it is smaller than the sum of its proper divisors (24202660).

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

20001500 is a wasteful number, since it uses less digits than its factorization.

20001500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 8.

The square root of 20001500 is about 4472.3036569535. The cubic root of 20001500 is about 271.4485475339.

Adding to 20001500 its reverse (510002), we get a palindrome (20511502).

The spelling of 20001500 in words is "twenty million, one thousand, five hundred".