20531513347 has 2 divisors, whose sum is σ = 20531513348. Its totient is φ = 20531513346.

The previous prime is 20531513341. The next prime is 20531513371. The reversal of 20531513347 is 74331513502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20531513347 - 2²⁷ = 20397295619 is a prime.

It is not a weakly prime, because it can be changed into another prime (20531513341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265756673 + 10265756674.

It is an arithmetic number, because the mean of its divisors is an integer number (10265756674).

Almost surely, 2^20531513347 is an apocalyptic number.

20531513347 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531513347 is an equidigital number, since it uses as much as digits as its factorization.

20531513347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 34.

The spelling of 20531513347 in words is "twenty billion, five hundred thirty-one million, five hundred thirteen thousand, three hundred forty-seven".