20461140 has 96 divisors (see below), whose sum is σ = 72764160. Its totient is φ = 4675968.

The previous prime is 20461139. The next prime is 20461151. The reversal of 20461140 is 4116402.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 31 ways as a sum of consecutive naturals, for example, 1074 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (757960).

Almost surely, 2^20461140 is an apocalyptic number.

20461140 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 20461140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36382080).

20461140 is an abundant number, since it is smaller than the sum of its proper divisors (52303020).

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

20461140 is a wasteful number, since it uses less digits than its factorization.

20461140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5438 (or 5430 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20461140 is about 4523.3991643453. The cubic root of 20461140 is about 273.5121409185.

Adding to 20461140 its reverse (4116402), we get a palindrome (24577542).

The spelling of 20461140 in words is "twenty million, four hundred sixty-one thousand, one hundred forty".