20212403 has 8 divisors (see below), whose sum is σ = 20935680. Its totient is φ = 19493640.

The previous prime is 20212399. The next prime is 20212417. The reversal of 20212403 is 30421202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20212403 - 2² = 20212399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212453) 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 7 ways as a sum of consecutive naturals, for example, 9818 + ... + 11696.

It is an arithmetic number, because the mean of its divisors is an integer number (2616960).

Almost surely, 2^20212403 is an apocalyptic number.

20212403 is a deficient number, since it is larger than the sum of its proper divisors (723277).

20212403 is a wasteful number, since it uses less digits than its factorization.

20212403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20212403 is about 4495.8206147488. The cubic root of 20212403 is about 272.3992973015.

Adding to 20212403 its reverse (30421202), we get a palindrome (50633605).

The spelling of 20212403 in words is "twenty million, two hundred twelve thousand, four hundred three".