20012004 has 36 divisors (see below), whose sum is σ = 50725584. Its totient is φ = 6652272.

The previous prime is 20011993. The next prime is 20012011. The reversal of 20012004 is 40021002.

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20659 + ... + 21605.

It is an arithmetic number, because the mean of its divisors is an integer number (1409044).

Almost surely, 2^20012004 is an apocalyptic number.

It is an amenable number.

20012004 is an abundant number, since it is smaller than the sum of its proper divisors (30713580).

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

20012004 is a wasteful number, since it uses less digits than its factorization.

20012004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544 (or 1539 counting only the distinct ones).

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

The square root of 20012004 is about 4473.4778416798. The cubic root of 20012004 is about 271.4960572467.

Adding to 20012004 its reverse (40021002), we get a palindrome (60033006).

It can be divided in two parts, 2001 and 2004, that added together give a triangular number (4005 = T₈₉).

The spelling of 20012004 in words is "twenty million, twelve thousand, four".