20675607657 has 8 divisors (see below), whose sum is σ = 27568141440. Its totient is φ = 13783406160.

The previous prime is 20675607643. The next prime is 20675607661. The reversal of 20675607657 is 75670657602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20675607657 - 2¹⁸ = 20675345513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20675607677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197319 + ... + 283347.

It is an arithmetic number, because the mean of its divisors is an integer number (3446017680).

Almost surely, 2^20675607657 is an apocalyptic number.

It is an amenable number.

20675607657 is a deficient number, since it is larger than the sum of its proper divisors (6892533783).

20675607657 is an equidigital number, since it uses as much as digits as its factorization.

20675607657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166143.

The product of its (nonzero) digits is 3704400, while the sum is 51.

The spelling of 20675607657 in words is "twenty billion, six hundred seventy-five million, six hundred seven thousand, six hundred fifty-seven".