20481500 has 96 divisors (see below), whose sum is σ = 50633856. Its totient is φ = 7180800.

The previous prime is 20481497. The next prime is 20481533. The reversal of 20481500 is 518402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149432 + ... + 149568.

It is an arithmetic number, because the mean of its divisors is an integer number (527436).

Almost surely, 2^20481500 is an apocalyptic number.

20481500 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 20481500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25316928).

20481500 is an abundant number, since it is smaller than the sum of its proper divisors (30152356).

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

20481500 is a wasteful number, since it uses less digits than its factorization.

20481500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20481500 is about 4525.6491247113. The cubic root of 20481500 is about 273.6028308987.

Adding to 20481500 its reverse (518402), we get a palindrome (20999902).

The spelling of 20481500 in words is "twenty million, four hundred eighty-one thousand, five hundred".