1020120003 has 72 divisors (see below), whose sum is σ = 1831900928. Its totient is φ = 535465728.

The previous prime is 1020119999. The next prime is 1020120041. The reversal of 1020120003 is 3000210201.

It is a happy number.

It is not a de Polignac number, because 1020120003 - 2² = 1020119999 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020120083) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 782250 + ... + 783552.

Almost surely, 2^1020120003 is an apocalyptic number.

1020120003 is a deficient number, since it is larger than the sum of its proper divisors (811780925).

1020120003 is a wasteful number, since it uses less digits than its factorization.

1020120003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393 (or 1373 counting only the distinct ones).

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

The square root of 1020120003 is about 31939.3175099281. The cubic root of 1020120003 is about 1006.6621843993.

Adding to 1020120003 its reverse (3000210201), we get a palindrome (4020330204).

The spelling of 1020120003 in words is "one billion, twenty million, one hundred twenty thousand, three".