20131040 has 48 divisors (see below), whose sum is σ = 48589632. Its totient is φ = 7878144.

The previous prime is 20131031. The next prime is 20131061. The reversal of 20131040 is 4013102.

It is a happy number.

It is a congruent number.

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, 6182 + ... + 8858.

It is an arithmetic number, because the mean of its divisors is an integer number (1012284).

Almost surely, 2^20131040 is an apocalyptic number.

20131040 is a gapful number since it is divisible by the number (20) 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 20131040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24294816).

20131040 is an abundant number, since it is smaller than the sum of its proper divisors (28458592).

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

20131040 is a wasteful number, since it uses less digits than its factorization.

20131040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739 (or 2731 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 20131040 is about 4486.7627528096. The cubic root of 20131040 is about 272.0333004212.

Adding to 20131040 its reverse (4013102), we get a palindrome (24144142).

The spelling of 20131040 in words is "twenty million, one hundred thirty-one thousand, forty".