20343929 has 4 divisors (see below), whose sum is σ = 20431476. Its totient is φ = 20256384.

The previous prime is 20343893. The next prime is 20343943. The reversal of 20343929 is 92934302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2408704 + 17935225 = 1552^2 + 4235^2 .

It is a cyclic number.

It is not a de Polignac number, because 20343929 - 2¹⁶ = 20278393 is a prime.

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 = 20343895 and 20343904.

It is not an unprimeable number, because it can be changed into a prime (20343949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43424 + ... + 43889.

It is an arithmetic number, because the mean of its divisors is an integer number (5107869).

Almost surely, 2^20343929 is an apocalyptic number.

It is an amenable number.

20343929 is a deficient number, since it is larger than the sum of its proper divisors (87547).

20343929 is an equidigital number, since it uses as much as digits as its factorization.

20343929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87546.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 20343929 is about 4510.4244811326. The cubic root of 20343929 is about 272.9888718869.

The spelling of 20343929 in words is "twenty million, three hundred forty-three thousand, nine hundred twenty-nine".