20649352975 has 6 divisors (see below), whose sum is σ = 25605197720. Its totient is φ = 16519482360.

The previous prime is 20649352967. The next prime is 20649352987. The reversal of 20649352975 is 57925394602.

It is not a de Polignac number, because 20649352975 - 2³ = 20649352967 is a prime.

It is a super-2 number, since 2×20649352975² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 412987035 + ... + 412987084.

Almost surely, 2^20649352975 is an apocalyptic number.

20649352975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20649352975 is a deficient number, since it is larger than the sum of its proper divisors (4955844745).

20649352975 is an equidigital number, since it uses as much as digits as its factorization.

20649352975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825974129 (or 825974124 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 52.

The spelling of 20649352975 in words is "twenty billion, six hundred forty-nine million, three hundred fifty-two thousand, nine hundred seventy-five".