20389347 has 36 divisors (see below), whose sum is σ = 33627720. Its totient is φ = 12200760.

The previous prime is 20389319. The next prime is 20389357. The reversal of 20389347 is 74398302.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 20389347 - 2⁷ = 20389219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20389357) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 258054 + ... + 258132.

Almost surely, 2^20389347 is an apocalyptic number.

20389347 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20389347 is a deficient number, since it is larger than the sum of its proper divisors (13238373).

20389347 is an equidigital number, since it uses as much as digits as its factorization.

20389347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 20389347 is about 4515.4564553321. The cubic root of 20389347 is about 273.1918709134.

It can be divided in two parts, 20389 and 347, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20389347 in words is "twenty million, three hundred eighty-nine thousand, three hundred forty-seven".