20681480 has 32 divisors (see below), whose sum is σ = 46794240. Its totient is φ = 8226240.

The previous prime is 20681477. The next prime is 20681491. The reversal of 20681480 is 8418602.

It is a super-2 number, since 2×20681480² = 855447229980800, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 6287 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (1462320).

Almost surely, 2^20681480 is an apocalyptic number.

20681480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20681480 is an abundant number, since it is smaller than the sum of its proper divisors (26112760).

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

20681480 is a wasteful number, since it uses less digits than its factorization.

20681480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909 (or 2905 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 20681480 is about 4547.6895232634. The cubic root of 20681480 is about 274.4904282536.

The spelling of 20681480 in words is "twenty million, six hundred eighty-one thousand, four hundred eighty".