13981020 has 48 divisors (see below), whose sum is σ = 40064640. Its totient is φ = 3640896.

The previous prime is 13981013. The next prime is 13981027. The reversal of 13981020 is 2018931.

It is an interprime number because it is at equal distance from previous prime (13981013) and next prime (13981027).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13981027) 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 15 ways as a sum of consecutive naturals, for example, 130 + ... + 5289.

It is an arithmetic number, because the mean of its divisors is an integer number (834680).

Almost surely, 2^13981020 is an apocalyptic number.

13981020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13981020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20032320).

13981020 is an abundant number, since it is smaller than the sum of its proper divisors (26083620).

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

13981020 is a wasteful number, since it uses less digits than its factorization.

13981020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474 (or 5472 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 13981020 is about 3739.1202173773. The cubic root of 13981020 is about 240.9052616844.

Adding to 13981020 its reverse (2018931), we get a palindrome (15999951).

The spelling of 13981020 in words is "thirteen million, nine hundred eighty-one thousand, twenty".