20453213 has 8 divisors (see below), whose sum is σ = 22619136. Its totient is φ = 18338400.

The previous prime is 20453203. The next prime is 20453269. The reversal of 20453213 is 31235402.

It is a happy number.

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 20453213 - 2¹⁸ = 20191069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20453203) 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, 11933 + ... + 13538.

It is an arithmetic number, because the mean of its divisors is an integer number (2827392).

Almost surely, 2^20453213 is an apocalyptic number.

It is an amenable number.

20453213 is a deficient number, since it is larger than the sum of its proper divisors (2165923).

20453213 is a wasteful number, since it uses less digits than its factorization.

20453213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25555.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20453213 is about 4522.5228578748. The cubic root of 20453213 is about 273.4768152427.

Adding to 20453213 its reverse (31235402), we get a palindrome (51688615).

The spelling of 20453213 in words is "twenty million, four hundred fifty-three thousand, two hundred thirteen".