20309529 has 8 divisors (see below), whose sum is σ = 28256832. Its totient is φ = 12950960.

The previous prime is 20309507. The next prime is 20309551. The reversal of 20309529 is 92590302.

It is an interprime number because it is at equal distance from previous prime (20309507) and next prime (20309551).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20309529 - 2¹⁵ = 20276761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20309496 and 20309505.

It is not an unprimeable number, because it can be changed into a prime (20309579) 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, 147102 + ... + 147239.

It is an arithmetic number, because the mean of its divisors is an integer number (3532104).

Almost surely, 2^20309529 is an apocalyptic number.

It is an amenable number.

20309529 is a deficient number, since it is larger than the sum of its proper divisors (7947303).

20309529 is a wasteful number, since it uses less digits than its factorization.

20309529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294367.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 20309529 is about 4506.6094794202. The cubic root of 20309529 is about 272.8349174366.

The spelling of 20309529 in words is "twenty million, three hundred nine thousand, five hundred twenty-nine".