20252520 has 96 divisors (see below), whose sum is σ = 66591720. Its totient is φ = 5337600.

The previous prime is 20252509. The next prime is 20252521. The reversal of 20252520 is 2525202.

It can be written as a sum of positive squares in 4 ways, for example, as 16990884 + 3261636 = 4122^2 + 1806^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20252493 and 20252502.

It is not an unprimeable number, because it can be changed into a prime (20252521) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 36082 + ... + 36638.

Almost surely, 2^20252520 is an apocalyptic number.

20252520 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 20252520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33295860).

20252520 is an abundant number, since it is smaller than the sum of its proper divisors (46339200).

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

20252520 is a wasteful number, since it uses less digits than its factorization.

20252520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 668 counting only the distinct ones).

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

The square root of 20252520 is about 4500.2799912894. The cubic root of 20252520 is about 272.5793949840.

Adding to 20252520 its reverse (2525202), we get a palindrome (22777722).

The spelling of 20252520 in words is "twenty million, two hundred fifty-two thousand, five hundred twenty".