20305429 has 8 divisors (see below), whose sum is σ = 21579480. Its totient is φ = 19106368.

The previous prime is 20305427. The next prime is 20305451. The reversal of 20305429 is 92450302.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5880625 + 14424804 = 2425^2 + 3798^2 .

It is not a de Polignac number, because 20305429 - 2¹ = 20305427 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20305421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2847 + ... + 6979.

It is an arithmetic number, because the mean of its divisors is an integer number (2697435).

Almost surely, 2^20305429 is an apocalyptic number.

It is an amenable number.

20305429 is a deficient number, since it is larger than the sum of its proper divisors (1274051).

20305429 is an frugal number, since it uses more digits than its factorization.

20305429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184 (or 4150 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20305429 is about 4506.1545690311. The cubic root of 20305429 is about 272.8165566228.

The spelling of 20305429 in words is "twenty million, three hundred five thousand, four hundred twenty-nine".