20754785531 has 16 divisors (see below), whose sum is σ = 21428789760. Its totient is φ = 20091882720.

The previous prime is 20754785509. The next prime is 20754785567. The reversal of 20754785531 is 13558745702.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20754785531 is a prime.

It is a super-2 number, since 2×20754785531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20754785591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4004900 + ... + 4010078.

It is an arithmetic number, because the mean of its divisors is an integer number (1339299360).

Almost surely, 2^20754785531 is an apocalyptic number.

20754785531 is a deficient number, since it is larger than the sum of its proper divisors (674004229).

20754785531 is an equidigital number, since it uses as much as digits as its factorization.

20754785531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6226.

The product of its (nonzero) digits is 1176000, while the sum is 47.

The spelling of 20754785531 in words is "twenty billion, seven hundred fifty-four million, seven hundred eighty-five thousand, five hundred thirty-one".