20520252 has 36 divisors (see below), whose sum is σ = 52009776. Its totient is φ = 6821760.

The previous prime is 20520229. The next prime is 20520257. The reversal of 20520252 is 25202502.

It is a tau number, because it is divible by the number of its divisors (36).

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 (20520257) 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 11 ways as a sum of consecutive naturals, for example, 22852 + ... + 23732.

It is an arithmetic number, because the mean of its divisors is an integer number (1444716).

Almost surely, 2^20520252 is an apocalyptic number.

It is an amenable number.

20520252 is an abundant number, since it is smaller than the sum of its proper divisors (31489524).

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

20520252 is a wasteful number, since it uses less digits than its factorization.

20520252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538 (or 1533 counting only the distinct ones).

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

The square root of 20520252 is about 4529.9284762566. The cubic root of 20520252 is about 273.7752788316.

Adding to 20520252 its reverse (25202502), we get a palindrome (45722754).

The spelling of 20520252 in words is "twenty million, five hundred twenty thousand, two hundred fifty-two".