20531001031 has 16 divisors (see below), whose sum is σ = 22059786240. Its totient is φ = 19038913920.

The previous prime is 20531001011. The next prime is 20531001053. The reversal of 20531001031 is 13010013502.

It is a cyclic number.

It is not a de Polignac number, because 20531001031 - 2¹⁷ = 20530869959 is a prime.

It is a super-2 number, since 2×20531001031² (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 = 20531000996 and 20531001014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20531001011) 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, 638346 + ... + 669736.

It is an arithmetic number, because the mean of its divisors is an integer number (1378736640).

Almost surely, 2^20531001031 is an apocalyptic number.

20531001031 is a deficient number, since it is larger than the sum of its proper divisors (1528785209).

20531001031 is a wasteful number, since it uses less digits than its factorization.

20531001031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31974.

The product of its (nonzero) digits is 90, while the sum is 16.

Adding to 20531001031 its reverse (13010013502), we get a palindrome (33541014533).

The spelling of 20531001031 in words is "twenty billion, five hundred thirty-one million, one thousand, thirty-one".