20487980 has 12 divisors (see below), whose sum is σ = 43024800. Its totient is φ = 8195184.

The previous prime is 20487977. The next prime is 20487989. The reversal of 20487980 is 8978402.

It is not an unprimeable number, because it can be changed into a prime (20487989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512180 + ... + 512219.

It is an arithmetic number, because the mean of its divisors is an integer number (3585400).

Almost surely, 2^20487980 is an apocalyptic number.

20487980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20487980 is an abundant number, since it is smaller than the sum of its proper divisors (22536820).

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

20487980 is a wasteful number, since it uses less digits than its factorization.

20487980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024408 (or 1024406 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20487980 is about 4526.3649874927. The cubic root of 20487980 is about 273.6316822915.

The spelling of 20487980 in words is "twenty million, four hundred eighty-seven thousand, nine hundred eighty".