20405224553 has 8 divisors (see below), whose sum is σ = 24547638720. Its totient is φ = 16569655920.

The previous prime is 20405224549. The next prime is 20405224573. The reversal of 20405224553 is 35542250402.

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 20405224553 - 2² = 20405224549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20405224513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76711238 + ... + 76711503.

It is an arithmetic number, because the mean of its divisors is an integer number (3068454840).

Almost surely, 2^20405224553 is an apocalyptic number.

It is an amenable number.

20405224553 is a deficient number, since it is larger than the sum of its proper divisors (4142414167).

20405224553 is a wasteful number, since it uses less digits than its factorization.

20405224553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153422767.

The product of its (nonzero) digits is 48000, while the sum is 32.

Adding to 20405224553 its reverse (35542250402), we get a palindrome (55947474955).

The spelling of 20405224553 in words is "twenty billion, four hundred five million, two hundred twenty-four thousand, five hundred fifty-three".