20389760 has 32 divisors (see below), whose sum is σ = 48745800. Its totient is φ = 8155648.

The previous prime is 20389741. The next prime is 20389763. The reversal of 20389760 is 6798302.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 20389760.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20389763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15290 + ... + 16569.

Almost surely, 2^20389760 is an apocalyptic number.

20389760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20389760 is an abundant number, since it is smaller than the sum of its proper divisors (28356040).

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

20389760 is an equidigital number, since it uses as much as digits as its factorization.

20389760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31878 (or 31866 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 20389760 is about 4515.5021869112. The cubic root of 20389760 is about 273.1937154629.

The spelling of 20389760 in words is "twenty million, three hundred eighty-nine thousand, seven hundred sixty".