20975659403 has 4 divisors (see below), whose sum is σ = 20975995560. Its totient is φ = 20975323248.

The previous prime is 20975659391. The next prime is 20975659421. The reversal of 20975659403 is 30495657902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20975659403 - 2⁸ = 20975659147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20975655403) 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, 43898 + ... + 209471.

It is an arithmetic number, because the mean of its divisors is an integer number (5243998890).

Almost surely, 2^20975659403 is an apocalyptic number.

20975659403 is a deficient number, since it is larger than the sum of its proper divisors (336157).

20975659403 is an equidigital number, since it uses as much as digits as its factorization.

20975659403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336156.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 20975659403 in words is "twenty billion, nine hundred seventy-five million, six hundred fifty-nine thousand, four hundred three".