20013750 has 80 divisors (see below), whose sum is σ = 55669680. Its totient is φ = 5328000.

The previous prime is 20013739. The next prime is 20013751. The reversal of 20013750 is 5731002.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013751) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 33454 + ... + 34046.

It is an arithmetic number, because the mean of its divisors is an integer number (695871).

Almost surely, 2^20013750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20013750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27834840).

20013750 is an abundant number, since it is smaller than the sum of its proper divisors (35655930).

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

20013750 is an equidigital number, since it uses as much as digits as its factorization.

20013750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 20013750 is about 4473.6729876020. The cubic root of 20013750 is about 271.5039528132.

Adding to 20013750 its reverse (5731002), we get a palindrome (25744752).

The spelling of 20013750 in words is "twenty million, thirteen thousand, seven hundred fifty".