20692144877 has 2 divisors, whose sum is σ = 20692144878. Its totient is φ = 20692144876.

The previous prime is 20692144849. The next prime is 20692144897. The reversal of 20692144877 is 77844129602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17238114436 + 3454030441 = 131294^2 + 58771^2 .

It is a cyclic number.

It is not a de Polignac number, because 20692144877 - 2¹⁶ = 20692079341 is a prime.

It is a super-2 number, since 2×20692144877² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20692144897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10346072438 + 10346072439.

It is an arithmetic number, because the mean of its divisors is an integer number (10346072439).

Almost surely, 2^20692144877 is an apocalyptic number.

It is an amenable number.

20692144877 is a deficient number, since it is larger than the sum of its proper divisors (1).

20692144877 is an equidigital number, since it uses as much as digits as its factorization.

20692144877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 50.

The spelling of 20692144877 in words is "twenty billion, six hundred ninety-two million, one hundred forty-four thousand, eight hundred seventy-seven".