20481560 has 32 divisors (see below), whose sum is σ = 50274000. Its totient is φ = 7447680.

The previous prime is 20481557. The next prime is 20481577. The reversal of 20481560 is 6518402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22835 + ... + 23714.

Almost surely, 2^20481560 is an apocalyptic number.

20481560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20481560 is an abundant number, since it is smaller than the sum of its proper divisors (29792440).

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

20481560 is a wasteful number, since it uses less digits than its factorization.

20481560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46571 (or 46567 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20481560 is about 4525.6557535897. The cubic root of 20481560 is about 273.6030980692.

Adding to 20481560 its reverse (6518402), we get a palindrome (26999962).

The spelling of 20481560 in words is "twenty million, four hundred eighty-one thousand, five hundred sixty".