203020020 has 120 divisors (see below), whose sum is σ = 727905024. Its totient is φ = 46401984.

The previous prime is 203020019. The next prime is 203020031. The reversal of 203020020 is 20020302.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a junction number, because it is equal to n+sod(n) for n = 203019984 and 203020011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2389 + ... + 20291.

Almost surely, 2^203020020 is an apocalyptic number.

203020020 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 203020020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363952512).

203020020 is an abundant number, since it is smaller than the sum of its proper divisors (524885004).

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

203020020 is a wasteful number, since it uses less digits than its factorization.

203020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17931 (or 17920 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 203020020 is about 14248.5093957228. The cubic root of 203020020 is about 587.7323855086.

Adding to 203020020 its reverse (20020302), we get a palindrome (223040322).

The spelling of 203020020 in words is "two hundred three million, twenty thousand, twenty".