20029729 has 2 divisors, whose sum is σ = 20029730. Its totient is φ = 20029728.

The previous prime is 20029721. The next prime is 20029741. The reversal of 20029729 is 92792002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19784704 + 245025 = 4448^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 20029729 - 2³ = 20029721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20029729.

It is not a weakly prime, because it can be changed into another prime (20029721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10014864 + 10014865.

It is an arithmetic number, because the mean of its divisors is an integer number (10014865).

Almost surely, 2^20029729 is an apocalyptic number.

It is an amenable number.

20029729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20029729 is an equidigital number, since it uses as much as digits as its factorization.

20029729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20029729 is about 4475.4585239951. The cubic root of 20029729 is about 271.5761899434.

It can be divided in two parts, 200 and 29729, that added together give a square (29929 = 173²).

The spelling of 20029729 in words is "twenty million, twenty-nine thousand, seven hundred twenty-nine".