20839357 has 36 divisors (see below), whose sum is σ = 28284768. Its totient is φ = 15153600.

The previous prime is 20839339. The next prime is 20839367. The reversal of 20839357 is 75393802.

It is not a de Polignac number, because 20839357 - 2¹⁹ = 20315069 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 (20839327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 508257 + ... + 508297.

It is an arithmetic number, because the mean of its divisors is an integer number (785688).

Almost surely, 2^20839357 is an apocalyptic number.

It is an amenable number.

20839357 is a deficient number, since it is larger than the sum of its proper divisors (7445411).

20839357 is a wasteful number, since it uses less digits than its factorization.

20839357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 20839357 is about 4565.0144578084. The cubic root of 20839357 is about 275.1871211312.

The spelling of 20839357 in words is "twenty million, eight hundred thirty-nine thousand, three hundred fifty-seven".