20536140 has 48 divisors (see below), whose sum is σ = 58076928. Its totient is φ = 5421504.

The previous prime is 20536123. The next prime is 20536181. The reversal of 20536140 is 4163502.

It is a happy number.

It is an unprimeable number.

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, 4519 + ... + 7841.

It is an arithmetic number, because the mean of its divisors is an integer number (1209936).

Almost surely, 2^20536140 is an apocalyptic number.

20536140 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 20536140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29038464).

20536140 is an abundant number, since it is smaller than the sum of its proper divisors (37540788).

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

20536140 is a wasteful number, since it uses less digits than its factorization.

20536140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3438 (or 3436 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20536140 is about 4531.6818070116. The cubic root of 20536140 is about 273.8459183069.

Adding to 20536140 its reverse (4163502), we get a palindrome (24699642).

The spelling of 20536140 in words is "twenty million, five hundred thirty-six thousand, one hundred forty".