1020203550 has 72 divisors (see below), whose sum is σ = 2765340864. Its totient is φ = 269633280.

The previous prime is 1020203539. The next prime is 1020203579. The reversal of 1020203550 is 553020201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 40819 + ... + 60881.

It is an arithmetic number, because the mean of its divisors is an integer number (38407512).

Almost surely, 2^1020203550 is an apocalyptic number.

1020203550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1020203550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1382670432).

1020203550 is an abundant number, since it is smaller than the sum of its proper divisors (1745137314).

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

1020203550 is a wasteful number, since it uses less digits than its factorization.

1020203550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20194 (or 20186 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 1020203550 is about 31940.6253852363. The cubic root of 1020203550 is about 1006.6896652543.

Adding to 1020203550 its reverse (553020201), we get a palindrome (1573223751).

It can be divided in two parts, 102020 and 3550, that added together give a triangular number (105570 = T₄₅₉).

The spelling of 1020203550 in words is "one billion, twenty million, two hundred three thousand, five hundred fifty".