20490252 has 12 divisors (see below), whose sum is σ = 47810616. Its totient is φ = 6830080.

The previous prime is 20490251. The next prime is 20490257. The reversal of 20490252 is 25209402.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (20490251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 853749 + ... + 853772.

It is an arithmetic number, because the mean of its divisors is an integer number (3984218).

Almost surely, 2^20490252 is an apocalyptic number.

It is an amenable number.

20490252 is an abundant number, since it is smaller than the sum of its proper divisors (27320364).

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

20490252 is a wasteful number, since it uses less digits than its factorization.

20490252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1707528 (or 1707526 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 20490252 is about 4526.6159545515. The cubic root of 20490252 is about 273.6417966480.

Adding to 20490252 its reverse (25209402), we get a palindrome (45699654).

The spelling of 20490252 in words is "twenty million, four hundred ninety thousand, two hundred fifty-two".