20143800 has 216 divisors, whose sum is σ = 73700640. Its totient is φ = 4924800.

The previous prime is 20143789. The next prime is 20143801. The reversal of 20143800 is 834102.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143801) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 649785 + ... + 649815.

Almost surely, 2^20143800 is an apocalyptic number.

20143800 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 20143800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36850320).

20143800 is an abundant number, since it is smaller than the sum of its proper divisors (53556840).

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

20143800 is a wasteful number, since it uses less digits than its factorization.

20143800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20143800 is about 4488.1844881867. The cubic root of 20143800 is about 272.0907641154.

Adding to 20143800 its reverse (834102), we get a palindrome (20977902).

The spelling of 20143800 in words is "twenty million, one hundred forty-three thousand, eight hundred".