20981260 has 12 divisors (see below), whose sum is σ = 44060688. Its totient is φ = 8392496.

The previous prime is 20981249. The next prime is 20981273. The reversal of 20981260 is 6218902.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 524512 + ... + 524551.

It is an arithmetic number, because the mean of its divisors is an integer number (3671724).

Almost surely, 2^20981260 is an apocalyptic number.

20981260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20981260 is an abundant number, since it is smaller than the sum of its proper divisors (23079428).

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

20981260 is a wasteful number, since it uses less digits than its factorization.

20981260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1049072 (or 1049070 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 20981260 is about 4580.5305369575. The cubic root of 20981260 is about 275.8103261682.

The spelling of 20981260 in words is "twenty million, nine hundred eighty-one thousand, two hundred sixty".