20645854601 has 4 divisors (see below), whose sum is σ = 20995784400. Its totient is φ = 20295924804.

The previous prime is 20645854571. The next prime is 20645854633. The reversal of 20645854601 is 10645854602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20645854601 - 2¹⁰ = 20645853577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20645854681) 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 3 ways as a sum of consecutive naturals, for example, 174964811 + ... + 174964928.

It is an arithmetic number, because the mean of its divisors is an integer number (5248946100).

Almost surely, 2^20645854601 is an apocalyptic number.

It is an amenable number.

20645854601 is a deficient number, since it is larger than the sum of its proper divisors (349929799).

20645854601 is an equidigital number, since it uses as much as digits as its factorization.

20645854601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349929798.

The product of its (nonzero) digits is 230400, while the sum is 41.

Subtracting from 20645854601 its reverse (10645854602), we obtain a palindrome (9999999999).

The spelling of 20645854601 in words is "twenty billion, six hundred forty-five million, eight hundred fifty-four thousand, six hundred one".