203939820 has 144 divisors (see below), whose sum is σ = 748657728. Its totient is φ = 43868160.

The previous prime is 203939809. The next prime is 203939849. The reversal of 203939820 is 28939302.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16660 + ... + 26180.

It is an arithmetic number, because the mean of its divisors is an integer number (5199012).

Almost surely, 2^203939820 is an apocalyptic number.

203939820 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 203939820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374328864).

203939820 is an abundant number, since it is smaller than the sum of its proper divisors (544717908).

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

203939820 is a wasteful number, since it uses less digits than its factorization.

203939820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9560 (or 9555 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 203939820 is about 14280.7499803057. The cubic root of 203939820 is about 588.6186394696.

The spelling of 203939820 in words is "two hundred three million, nine hundred thirty-nine thousand, eight hundred twenty".