20811874729 has 2 divisors, whose sum is σ = 20811874730. Its totient is φ = 20811874728.

The previous prime is 20811874711. The next prime is 20811874747. The reversal of 20811874729 is 92747811802.

It is a balanced prime because it is at equal distance from previous prime (20811874711) and next prime (20811874747).

It can be written as a sum of positive squares in only one way, i.e., 18266874025 + 2545000704 = 135155^2 + 50448^2 .

It is a cyclic number.

It is not a de Polignac number, because 20811874729 - 2²⁷ = 20677657001 is a prime.

It is not a weakly prime, because it can be changed into another prime (20811872729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10405937364 + 10405937365.

It is an arithmetic number, because the mean of its divisors is an integer number (10405937365).

Almost surely, 2^20811874729 is an apocalyptic number.

It is an amenable number.

20811874729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20811874729 is an equidigital number, since it uses as much as digits as its factorization.

20811874729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 49.

The spelling of 20811874729 in words is "twenty billion, eight hundred eleven million, eight hundred seventy-four thousand, seven hundred twenty-nine".