20389080 has 32 divisors (see below), whose sum is σ = 61167600. Its totient is φ = 5437056.

The previous prime is 20389073. The next prime is 20389081. The reversal of 20389080 is 8098302.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84835 + ... + 85074.

Almost surely, 2^20389080 is an apocalyptic number.

20389080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20389080 is an abundant number, since it is smaller than the sum of its proper divisors (40778520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20389080 is a wasteful number, since it uses less digits than its factorization.

20389080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169923 (or 169919 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 20389080 is about 4515.4268901179. The cubic root of 20389080 is about 273.1906784189.

The spelling of 20389080 in words is "twenty million, three hundred eighty-nine thousand, eighty".