20389960 has 64 divisors (see below), whose sum is σ = 49248000. Its totient is φ = 7577856.

The previous prime is 20389951. The next prime is 20389991. The reversal of 20389960 is 6998302.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33741 + ... + 34339.

It is an arithmetic number, because the mean of its divisors is an integer number (769500).

Almost surely, 2^20389960 is an apocalyptic number.

20389960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20389960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24624000).

20389960 is an abundant number, since it is smaller than the sum of its proper divisors (28858040).

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

20389960 is a wasteful number, since it uses less digits than its factorization.

20389960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20389960 is about 4515.5243327879. The cubic root of 20389960 is about 273.1946086982.

The spelling of 20389960 in words is "twenty million, three hundred eighty-nine thousand, nine hundred sixty".