20877950328869 has 2 divisors, whose sum is σ = 20877950328870. Its totient is φ = 20877950328868.

The previous prime is 20877950328817. The next prime is 20877950328881. The reversal of 20877950328869 is 96882305977802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12160912562500 + 8717037766369 = 3487250^2 + 2952463^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20877950328869 is a prime.

It is a super-2 number, since 2×20877950328869² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20877950328796 and 20877950328805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20877950327869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10438975164434 + 10438975164435.

It is an arithmetic number, because the mean of its divisors is an integer number (10438975164435).

Almost surely, 2^{20877950328869} is an apocalyptic number.

It is an amenable number.

20877950328869 is a deficient number, since it is larger than the sum of its proper divisors (1).

20877950328869 is an equidigital number, since it uses as much as digits as its factorization.

20877950328869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 731566080, while the sum is 74.

The spelling of 20877950328869 in words is "twenty trillion, eight hundred seventy-seven billion, nine hundred fifty million, three hundred twenty-eight thousand, eight hundred sixty-nine".