1020002004 has 96 divisors (see below), whose sum is σ = 3181337600. Its totient is φ = 276086880.

The previous prime is 1020001991. The next prime is 1020002017. The reversal of 1020002004 is 4002000201.

It is an interprime number because it is at equal distance from previous prime (1020001991) and next prime (1020002017).

It is a super-4 number, since 4×1020002004⁴ (a number of 37 digits) contains 4444 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21142 + ... + 49869.

Almost surely, 2^1020002004 is an apocalyptic number.

1020002004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1020002004 is an abundant number, since it is smaller than the sum of its proper divisors (2161335596).

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

1020002004 is a wasteful number, since it uses less digits than its factorization.

1020002004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71050 (or 71042 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 1020002004 is about 31937.4702191642. The cubic root of 1020002004 is about 1006.6233687989.

Adding to 1020002004 its reverse (4002000201), we get a palindrome (5022002205).

The spelling of 1020002004 in words is "one billion, twenty million, two thousand, four".