203021020 has 12 divisors (see below), whose sum is σ = 426344184. Its totient is φ = 81208400.

The previous prime is 203020999. The next prime is 203021029. The reversal of 203021020 is 20120302.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 203020988 and 203021006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203021029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5075506 + ... + 5075545.

It is an arithmetic number, because the mean of its divisors is an integer number (35528682).

Almost surely, 2^203021020 is an apocalyptic number.

203021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203021020 is an abundant number, since it is smaller than the sum of its proper divisors (223323164).

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

203021020 is a wasteful number, since it uses less digits than its factorization.

203021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10151060 (or 10151058 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 203021020 is about 14248.5444870695. The cubic root of 203021020 is about 587.7333504897.

Adding to 203021020 its reverse (20120302), we get a palindrome (223141322).

The spelling of 203021020 in words is "two hundred three million, twenty-one thousand, twenty".