20653835601 has 144 divisors (see below), whose sum is σ = 35465772096. Its totient is φ = 10648205568.

The previous prime is 20653835597. The next prime is 20653835611. The reversal of 20653835601 is 10653835602.

It is not a de Polignac number, because 20653835601 - 2² = 20653835597 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20653835601.

It is not an unprimeable number, because it can be changed into a prime (20653835611) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 131553015 + ... + 131553171.

It is an arithmetic number, because the mean of its divisors is an integer number (246290084).

Almost surely, 2^20653835601 is an apocalyptic number.

20653835601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20653835601 is a deficient number, since it is larger than the sum of its proper divisors (14811936495).

20653835601 is a wasteful number, since it uses less digits than its factorization.

20653835601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

Subtracting from 20653835601 its reverse (10653835602), we obtain a palindrome (9999999999).

The spelling of 20653835601 in words is "twenty billion, six hundred fifty-three million, eight hundred thirty-five thousand, six hundred one".