203105557020 has 24 divisors (see below), whose sum is σ = 568695559824. Its totient is φ = 54161481856.

The previous prime is 203105557003. The next prime is 203105557027. The reversal of 203105557020 is 20755501302.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203105557027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1692546249 + ... + 1692546368.

It is an arithmetic number, because the mean of its divisors is an integer number (23695648326).

Almost surely, 2^203105557020 is an apocalyptic number.

203105557020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

203105557020 is an abundant number, since it is smaller than the sum of its proper divisors (365590002804).

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

203105557020 is a wasteful number, since it uses less digits than its factorization.

203105557020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3385092629 (or 3385092627 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 30.

The spelling of 203105557020 in words is "two hundred three billion, one hundred five million, five hundred fifty-seven thousand, twenty".