20243213453 has 4 divisors (see below), whose sum is σ = 21308645760. Its totient is φ = 19177781148.

The previous prime is 20243213423. The next prime is 20243213519. The reversal of 20243213453 is 35431234202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20243213453 - 2⁸ = 20243213197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243213423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532716125 + ... + 532716162.

It is an arithmetic number, because the mean of its divisors is an integer number (5327161440).

Almost surely, 2^20243213453 is an apocalyptic number.

It is an amenable number.

20243213453 is a deficient number, since it is larger than the sum of its proper divisors (1065432307).

20243213453 is a wasteful number, since it uses less digits than its factorization.

20243213453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065432306.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 20243213453 its reverse (35431234202), we get a palindrome (55674447655).

The spelling of 20243213453 in words is "twenty billion, two hundred forty-three million, two hundred thirteen thousand, four hundred fifty-three".