20531211353 has 4 divisors (see below), whose sum is σ = 20535637968. Its totient is φ = 20526784740.

The previous prime is 20531211343. The next prime is 20531211377. The reversal of 20531211353 is 35311213502.

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 20531211353 - 2¹⁸ = 20530949209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531211313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2206343 + ... + 2215628.

It is an arithmetic number, because the mean of its divisors is an integer number (5133909492).

Almost surely, 2^20531211353 is an apocalyptic number.

It is an amenable number.

20531211353 is a deficient number, since it is larger than the sum of its proper divisors (4426615).

20531211353 is an equidigital number, since it uses as much as digits as its factorization.

20531211353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4426614.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 20531211353 its reverse (35311213502), we get a palindrome (55842424855).

The spelling of 20531211353 in words is "twenty billion, five hundred thirty-one million, two hundred eleven thousand, three hundred fifty-three".