1004120020 has 24 divisors (see below), whose sum is σ = 2135347200. Its totient is φ = 396563232.

The previous prime is 1004120003. The next prime is 1004120027. The reversal of 1004120020 is 200214001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1004119979 and 1004120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1004120027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316180 + ... + 319339.

It is an arithmetic number, because the mean of its divisors is an integer number (88972800).

Almost surely, 2^1004120020 is an apocalyptic number.

1004120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1004120020 is an abundant number, since it is smaller than the sum of its proper divisors (1131227180).

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

1004120020 is a wasteful number, since it uses less digits than its factorization.

1004120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635607 (or 635605 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1004120020 is about 31687.8528777196. The cubic root of 1004120020 is about 1001.3714582424.

Adding to 1004120020 its reverse (200214001), we get a palindrome (1204334021).

The spelling of 1004120020 in words is "one billion, four million, one hundred twenty thousand, twenty".