20929239 has 8 divisors (see below), whose sum is σ = 31006320. Its totient is φ = 13952808.

The previous prime is 20929177. The next prime is 20929253. The reversal of 20929239 is 93292902.

It is not a de Polignac number, because 20929239 - 2¹⁵ = 20896471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20929339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 387552 + ... + 387605.

It is an arithmetic number, because the mean of its divisors is an integer number (3875790).

Almost surely, 2^20929239 is an apocalyptic number.

20929239 is a deficient number, since it is larger than the sum of its proper divisors (10077081).

20929239 is an equidigital number, since it uses as much as digits as its factorization.

20929239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775166 (or 775160 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 20929239 is about 4574.8485220825. The cubic root of 20929239 is about 275.5821891952.

The spelling of 20929239 in words is "twenty million, nine hundred twenty-nine thousand, two hundred thirty-nine".