20953607818541 has 4 divisors (see below), whose sum is σ = 20984742451932. Its totient is φ = 20922473185152.

The previous prime is 20953607818519. The next prime is 20953607818543. The reversal of 20953607818541 is 14581870635902.

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 11022758562916 + 9930849255625 = 3320054^2 + 3151325^2 .

It is a cyclic number.

It is not a de Polignac number, because 20953607818541 - 2¹⁴ = 20953607802157 is a prime.

It is a super-2 number, since 2×20953607818541² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953607818543) 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, 15567315686 + ... + 15567317031.

It is an arithmetic number, because the mean of its divisors is an integer number (5246185612983).

It is a 2-persistent number, because it is pandigital, and so is 2⋅20953607818541 = 41907215637082, but 3⋅20953607818541 = 62860823455623 is not.

Almost surely, 2^{20953607818541} is an apocalyptic number.

It is an amenable number.

20953607818541 is a deficient number, since it is larger than the sum of its proper divisors (31134633391).

20953607818541 is an equidigital number, since it uses as much as digits as its factorization.

20953607818541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31134633390.

The product of its (nonzero) digits is 14515200, while the sum is 59.

The spelling of 20953607818541 in words is "twenty trillion, nine hundred fifty-three billion, six hundred seven million, eight hundred eighteen thousand, five hundred forty-one".