1020020001003 has 12 divisors (see below), whose sum is σ = 1473750306288. Its totient is φ = 679834218960.

The previous prime is 1020020000999. The next prime is 1020020001043. The reversal of 1020020001003 is 3001000200201.

It is a happy number.

It is not a de Polignac number, because 1020020001003 - 2² = 1020020000999 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1020020001043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14890183 + ... + 14958528.

It is an arithmetic number, because the mean of its divisors is an integer number (122812525524).

Almost surely, 2^{1020020001003} is an apocalyptic number.

1020020001003 is a deficient number, since it is larger than the sum of its proper divisors (453730305285).

1020020001003 is a wasteful number, since it uses less digits than its factorization.

1020020001003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29852514 (or 29852511 counting only the distinct ones).

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

Adding to 1020020001003 its reverse (3001000200201), we get a palindrome (4021020201204).

The spelling of 1020020001003 in words is "one trillion, twenty billion, twenty million, one thousand, three".