20452540 has 48 divisors (see below), whose sum is σ = 44906400. Its totient is φ = 7814912.

The previous prime is 20452519. The next prime is 20452559. The reversal of 20452540 is 4525402.

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 15 ways as a sum of consecutive naturals, for example, 103722 + ... + 103918.

It is an arithmetic number, because the mean of its divisors is an integer number (935550).

Almost surely, 2^20452540 is an apocalyptic number.

20452540 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 20452540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22453200).

20452540 is an abundant number, since it is smaller than the sum of its proper divisors (24453860).

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

20452540 is a wasteful number, since it uses less digits than its factorization.

20452540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 20452540 is about 4522.4484518898. The cubic root of 20452540 is about 273.4738156828.

Adding to 20452540 its reverse (4525402), we get a palindrome (24977942).

The spelling of 20452540 in words is "twenty million, four hundred fifty-two thousand, five hundred forty".