20531001353 has 4 divisors (see below), whose sum is σ = 20531690820. Its totient is φ = 20530311888.

The previous prime is 20531001349. The next prime is 20531001367. The reversal of 20531001353 is 35310013502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5247118969 + 15283882384 = 72437^2 + 123628^2 .

It is a cyclic number.

It is not a de Polignac number, because 20531001353 - 2² = 20531001349 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531001053) 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, 297950 + ... + 360327.

It is an arithmetic number, because the mean of its divisors is an integer number (5132922705).

Almost surely, 2^20531001353 is an apocalyptic number.

It is an amenable number.

20531001353 is a deficient number, since it is larger than the sum of its proper divisors (689467).

20531001353 is an equidigital number, since it uses as much as digits as its factorization.

20531001353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689466.

The product of its (nonzero) digits is 1350, while the sum is 23.

Adding to 20531001353 its reverse (35310013502), we get a palindrome (55841014855).

The spelling of 20531001353 in words is "twenty billion, five hundred thirty-one million, one thousand, three hundred fifty-three".