203112520215220 has 144 divisors (see below), whose sum is σ = 541417485450240. Its totient is φ = 63291914515200.

The previous prime is 203112520215197. The next prime is 203112520215229. The reversal of 203112520215220 is 22512025211302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203112520215229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40639725 + ... + 45363115.

It is an arithmetic number, because the mean of its divisors is an integer number (3759843648960).

Almost surely, 2^{203112520215220} is an apocalyptic number.

203112520215220 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 203112520215220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270708742725120).

203112520215220 is an abundant number, since it is smaller than the sum of its proper divisors (338304965235020).

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

203112520215220 is a wasteful number, since it uses less digits than its factorization.

203112520215220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4727414 (or 4727405 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 203112520215220 its reverse (22512025211302), we get a palindrome (225624545426522).

The spelling of 203112520215220 in words is "two hundred three trillion, one hundred twelve billion, five hundred twenty million, two hundred fifteen thousand, two hundred twenty".