20531203331 has 16 divisors (see below), whose sum is σ = 22888834560. Its totient is φ = 18301852800.

The previous prime is 20531203321. The next prime is 20531203397. The reversal of 20531203331 is 13330213502.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20531203331 is a prime.

It is a super-2 number, since 2×20531203331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20531203297 and 20531203306.

It is not an unprimeable number, because it can be changed into a prime (20531203321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2370050 + ... + 2378696.

It is an arithmetic number, because the mean of its divisors is an integer number (1430552160).

Almost surely, 2^20531203331 is an apocalyptic number.

20531203331 is a deficient number, since it is larger than the sum of its proper divisors (2357631229).

20531203331 is a wasteful number, since it uses less digits than its factorization.

20531203331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16034.

The product of its (nonzero) digits is 1620, while the sum is 23.

Adding to 20531203331 its reverse (13330213502), we get a palindrome (33861416833).

The spelling of 20531203331 in words is "twenty billion, five hundred thirty-one million, two hundred three thousand, three hundred thirty-one".