52020540 has 288 divisors, whose sum is σ = 193729536. Its totient is φ = 11128320.

The previous prime is 52020539. The next prime is 52020547. The reversal of 52020540 is 4502025.

52020540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×52020540² = 5412273163783200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52020547) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 1106797 + ... + 1106843.

It is an arithmetic number, because the mean of its divisors is an integer number (672672).

Almost surely, 2^52020540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52020540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96864768).

52020540 is an abundant number, since it is smaller than the sum of its proper divisors (141708996).

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

52020540 is a wasteful number, since it uses less digits than its factorization.

52020540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 52020540 is about 7212.5266030705. The cubic root of 52020540 is about 373.3002539427.

Adding to 52020540 its reverse (4502025), we get a palindrome (56522565).

The spelling of 52020540 in words is "fifty-two million, twenty thousand, five hundred forty".