20503547531 has 2 divisors, whose sum is σ = 20503547532. Its totient is φ = 20503547530.

The previous prime is 20503547503. The next prime is 20503547567. The reversal of 20503547531 is 13574530502.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20503547531 is a prime.

It is a super-2 number, since 2×20503547531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20503547491 and 20503547500.

It is not a weakly prime, because it can be changed into another prime (20503547431) 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 as a sum of consecutive naturals, namely, 10251773765 + 10251773766.

It is an arithmetic number, because the mean of its divisors is an integer number (10251773766).

Almost surely, 2^20503547531 is an apocalyptic number.

20503547531 is a deficient number, since it is larger than the sum of its proper divisors (1).

20503547531 is an equidigital number, since it uses as much as digits as its factorization.

20503547531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 35.

The spelling of 20503547531 in words is "twenty billion, five hundred three million, five hundred forty-seven thousand, five hundred thirty-one".