20401140 has 48 divisors (see below), whose sum is σ = 57939840. Its totient is φ = 5362560.

The previous prime is 20401127. The next prime is 20401141. The reversal of 20401140 is 4110402.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20401141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1866 + ... + 6654.

It is an arithmetic number, because the mean of its divisors is an integer number (1207080).

Almost surely, 2^20401140 is an apocalyptic number.

20401140 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 20401140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28969920).

20401140 is an abundant number, since it is smaller than the sum of its proper divisors (37538700).

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

20401140 is a wasteful number, since it uses less digits than its factorization.

20401140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4872 (or 4870 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 20401140 is about 4516.7621146126. The cubic root of 20401140 is about 273.2445312689.

Adding to 20401140 its reverse (4110402), we get a palindrome (24511542).

The spelling of 20401140 in words is "twenty million, four hundred one thousand, one hundred forty".