20481520 has 20 divisors (see below), whose sum is σ = 47619720. Its totient is φ = 8192576.

The previous prime is 20481497. The next prime is 20481533. The reversal of 20481520 is 2518402.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 20481491 and 20481500.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 127930 + ... + 128089.

It is an arithmetic number, because the mean of its divisors is an integer number (2380986).

Almost surely, 2^20481520 is an apocalyptic number.

20481520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20481520 is an abundant number, since it is smaller than the sum of its proper divisors (27138200).

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

20481520 is a wasteful number, since it uses less digits than its factorization.

20481520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256032 (or 256026 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20481520 is about 4525.6513343385. The cubic root of 20481520 is about 273.6029199556.

Adding to 20481520 its reverse (2518402), we get a palindrome (22999922).

The spelling of 20481520 in words is "twenty million, four hundred eighty-one thousand, five hundred twenty".