1001203020 has 36 divisors (see below), whose sum is σ = 3036983040. Its totient is φ = 266987424.

The previous prime is 1001203009. The next prime is 1001203033. The reversal of 1001203020 is 203021001.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 1001202993 and 1001203011.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2780940 + ... + 2781299.

It is an arithmetic number, because the mean of its divisors is an integer number (84360640).

Almost surely, 2^1001203020 is an apocalyptic number.

1001203020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001203020 is an abundant number, since it is smaller than the sum of its proper divisors (2035780020).

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

1001203020 is a wasteful number, since it uses less digits than its factorization.

1001203020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5562254 (or 5562249 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 1001203020 is about 31641.7923006899. The cubic root of 1001203020 is about 1000.4008459677.

Adding to 1001203020 its reverse (203021001), we get a palindrome (1204224021).

The spelling of 1001203020 in words is "one billion, one million, two hundred three thousand, twenty".