20212424 has 8 divisors (see below), whose sum is σ = 37898310. Its totient is φ = 10106208.

The previous prime is 20212421. The next prime is 20212453. The reversal of 20212424 is 42421202.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18335524 + 1876900 = 4282^2 + 1370^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (20212421) 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 as a sum of consecutive naturals, namely, 1263269 + ... + 1263284.

Almost surely, 2^20212424 is an apocalyptic number.

It is an amenable number.

20212424 is a deficient number, since it is larger than the sum of its proper divisors (17685886).

20212424 is a wasteful number, since it uses less digits than its factorization.

20212424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526559 (or 2526555 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 20212424 is about 4495.8229502506. The cubic root of 20212424 is about 272.3993916393.

Adding to 20212424 its reverse (42421202), we get a palindrome (62633626).

The spelling of 20212424 in words is "twenty million, two hundred twelve thousand, four hundred twenty-four".