20877766777841 has 4 divisors (see below), whose sum is σ = 20904775532532. Its totient is φ = 20850758023152.

The previous prime is 20877766777811. The next prime is 20877766777871. The reversal of 20877766777841 is 14877766777802.

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

It is an interprime number because it is at equal distance from previous prime (20877766777811) and next prime (20877766777871).

It can be written as a sum of positive squares in 2 ways, for example, as 1030385376241 + 19847381401600 = 1015079^2 + 4455040^2 .

It is a cyclic number.

It is not a de Polignac number, because 20877766777841 - 2²⁶ = 20877699668977 is a prime.

It is a super-2 number, since 2×20877766777841² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20877766777811) 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, 13504376186 + ... + 13504377731.

It is an arithmetic number, because the mean of its divisors is an integer number (5226193883133).

Almost surely, 2^{20877766777841} is an apocalyptic number.

It is an amenable number.

20877766777841 is a deficient number, since it is larger than the sum of its proper divisors (27008754691).

20877766777841 is an equidigital number, since it uses as much as digits as its factorization.

20877766777841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27008754690.

The product of its (nonzero) digits is 2168506368, while the sum is 77.

The spelling of 20877766777841 in words is "twenty trillion, eight hundred seventy-seven billion, seven hundred sixty-six million, seven hundred seventy-seven thousand, eight hundred forty-one".