20812818601 has 4 divisors (see below), whose sum is σ = 20815780752. Its totient is φ = 20809856452.

The previous prime is 20812818577. The next prime is 20812818613. The reversal of 20812818601 is 10681821802.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 10681821802 = 2 ⋅5340910901.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20812818601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20812818641) 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, 1470511 + ... + 1484596.

It is an arithmetic number, because the mean of its divisors is an integer number (5203945188).

Almost surely, 2^20812818601 is an apocalyptic number.

It is an amenable number.

20812818601 is a deficient number, since it is larger than the sum of its proper divisors (2962151).

20812818601 is an equidigital number, since it uses as much as digits as its factorization.

20812818601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2962150.

The product of its (nonzero) digits is 12288, while the sum is 37.

The spelling of 20812818601 in words is "twenty billion, eight hundred twelve million, eight hundred eighteen thousand, six hundred one".