20303729 has 16 divisors (see below), whose sum is σ = 22602240. Its totient is φ = 18151680.

The previous prime is 20303719. The next prime is 20303807. The reversal of 20303729 is 92730302.

It is a cyclic number.

It is not a de Polignac number, because 20303729 - 2²⁰ = 19255153 is a prime.

It is a super-2 number, since 2×20303729² = 824482822610882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20303698 and 20303707.

It is not an unprimeable number, because it can be changed into a prime (20303719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30767 + ... + 31419.

It is an arithmetic number, because the mean of its divisors is an integer number (1412640).

Almost surely, 2^20303729 is an apocalyptic number.

It is an amenable number.

20303729 is a deficient number, since it is larger than the sum of its proper divisors (2298511).

20303729 is a wasteful number, since it uses less digits than its factorization.

20303729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 20303729 is about 4505.9659341810. The cubic root of 20303729 is about 272.8089428775.

The spelling of 20303729 in words is "twenty million, three hundred three thousand, seven hundred twenty-nine".