20040012 has 36 divisors (see below), whose sum is σ = 52293696. Its totient is φ = 6464160.

The previous prime is 20039993. The next prime is 20040049. The reversal of 20040012 is 21004002.

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 a junction number, because it is equal to n+sod(n) for n = 20039976 and 20040003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7863 + ... + 10094.

Almost surely, 2^20040012 is an apocalyptic number.

It is an amenable number.

20040012 is an abundant number, since it is smaller than the sum of its proper divisors (32253684).

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

20040012 is a wasteful number, since it uses less digits than its factorization.

20040012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17998 (or 17993 counting only the distinct ones).

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

The square root of 20040012 is about 4476.6071974208. The cubic root of 20040012 is about 271.6226565431.

Adding to 20040012 its reverse (21004002), we get a palindrome (41044014).

The spelling of 20040012 in words is "twenty million, forty thousand, twelve".