20013653122553 has 4 divisors (see below), whose sum is σ = 20015363556708. Its totient is φ = 20011942688400.

The previous prime is 20013653122501. The next prime is 20013653122579. The reversal of 20013653122553 is 35522135631002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6521526697984 + 13492126424569 = 2553728^2 + 3673163^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013653122553 - 2³² = 20009358155257 is a prime.

It is a super-2 number, since 2×20013653122553² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013653122753) 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, 855199526 + ... + 855222927.

It is an arithmetic number, because the mean of its divisors is an integer number (5003840889177).

Almost surely, 2^{20013653122553} is an apocalyptic number.

It is an amenable number.

20013653122553 is a deficient number, since it is larger than the sum of its proper divisors (1710434155).

20013653122553 is a wasteful number, since it uses less digits than its factorization.

20013653122553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1710434154.

The product of its (nonzero) digits is 162000, while the sum is 38.

Adding to 20013653122553 its reverse (35522135631002), we get a palindrome (55535788753555).

The spelling of 20013653122553 in words is "twenty trillion, thirteen billion, six hundred fifty-three million, one hundred twenty-two thousand, five hundred fifty-three".