20481880 has 16 divisors (see below), whose sum is σ = 46084320. Its totient is φ = 8192736.

The previous prime is 20481871. The next prime is 20481887. The reversal of 20481880 is 8818402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20481887) by changing a digit.

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, 255984 + ... + 256063.

It is an arithmetic number, because the mean of its divisors is an integer number (2880270).

Almost surely, 2^20481880 is an apocalyptic number.

20481880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20481880 is an abundant number, since it is smaller than the sum of its proper divisors (25602440).

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

20481880 is a wasteful number, since it uses less digits than its factorization.

20481880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512058 (or 512054 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 20481880 is about 4525.6911074443. The cubic root of 20481880 is about 273.6045229694.

The spelling of 20481880 in words is "twenty million, four hundred eighty-one thousand, eight hundred eighty".