20212729 has 2 divisors, whose sum is σ = 20212730. Its totient is φ = 20212728.

The previous prime is 20212723. The next prime is 20212747. The reversal of 20212729 is 92721202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 5405625 = 3848^2 + 2325^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212729 - 2³ = 20212721 is a prime.

It is not a weakly prime, because it can be changed into another prime (20212721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106364 + 10106365.

It is an arithmetic number, because the mean of its divisors is an integer number (10106365).

Almost surely, 2^20212729 is an apocalyptic number.

It is an amenable number.

20212729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212729 is an equidigital number, since it uses as much as digits as its factorization.

20212729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20212729 is about 4495.8568704975. The cubic root of 20212729 is about 272.4007617767.

The spelling of 20212729 in words is "twenty million, two hundred twelve thousand, seven hundred twenty-nine".