20531583645793 has 16 divisors (see below), whose sum is σ = 22575125790720. Its totient is φ = 18517556005200.

The previous prime is 20531583645787. The next prime is 20531583645799. The reversal of 20531583645793 is 39754638513502.

It is an interprime number because it is at equal distance from previous prime (20531583645787) and next prime (20531583645799).

It is not a de Polignac number, because 20531583645793 - 2¹⁷ = 20531583514721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20531583645799) 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, 51057048 + ... + 51457606.

It is an arithmetic number, because the mean of its divisors is an integer number (1410945361920).

It is a 2-persistent number, because it is pandigital, and so is 2⋅20531583645793 = 41063167291586, but 3⋅20531583645793 = 61594750937379 is not.

Almost surely, 2^{20531583645793} is an apocalyptic number.

It is an amenable number.

20531583645793 is a deficient number, since it is larger than the sum of its proper divisors (2043542144927).

20531583645793 is a wasteful number, since it uses less digits than its factorization.

20531583645793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437388.

The product of its (nonzero) digits is 81648000, while the sum is 61.

The spelling of 20531583645793 in words is "twenty trillion, five hundred thirty-one billion, five hundred eighty-three million, six hundred forty-five thousand, seven hundred ninety-three".