20754785523 has 4 divisors (see below), whose sum is σ = 27673047368. Its totient is φ = 13836523680.

The previous prime is 20754785509. The next prime is 20754785567. The reversal of 20754785523 is 32558745702.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20754785523 - 2⁸ = 20754785267 is a prime.

It is a super-2 number, since 2×20754785523² (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 (20754785503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3459130918 + ... + 3459130923.

It is an arithmetic number, because the mean of its divisors is an integer number (6918261842).

Almost surely, 2^20754785523 is an apocalyptic number.

20754785523 is a deficient number, since it is larger than the sum of its proper divisors (6918261845).

20754785523 is an equidigital number, since it uses as much as digits as its factorization.

20754785523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918261844.

The product of its (nonzero) digits is 2352000, while the sum is 48.

The spelling of 20754785523 in words is "twenty billion, seven hundred fifty-four million, seven hundred eighty-five thousand, five hundred twenty-three".