20851383 has 8 divisors (see below), whose sum is σ = 31773568. Its totient is φ = 11915064.

The previous prime is 20851361. The next prime is 20851399. The reversal of 20851383 is 38315802.

It is a happy number.

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

It is not a de Polignac number, because 20851383 - 2⁹ = 20850871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20851383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20851283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496441 + ... + 496482.

It is an arithmetic number, because the mean of its divisors is an integer number (3971696).

Almost surely, 2^20851383 is an apocalyptic number.

20851383 is a deficient number, since it is larger than the sum of its proper divisors (10922185).

20851383 is an equidigital number, since it uses as much as digits as its factorization.

20851383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992933.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 20851383 is about 4566.3314597169. The cubic root of 20851383 is about 275.2400460515.

The spelling of 20851383 in words is "twenty million, eight hundred fifty-one thousand, three hundred eighty-three".