20012001 has 32 divisors (see below), whose sum is σ = 29410560. Its totient is φ = 12063744.

The previous prime is 20011993. The next prime is 20012011. The reversal of 20012001 is 10021002.

It is a happy number.

It is not a de Polignac number, because 20012001 - 2³ = 20011993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20012011) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 146005 + ... + 146141.

It is an arithmetic number, because the mean of its divisors is an integer number (919080).

Almost surely, 2^20012001 is an apocalyptic number.

It is an amenable number.

20012001 is a deficient number, since it is larger than the sum of its proper divisors (9398559).

20012001 is a wasteful number, since it uses less digits than its factorization.

20012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265.

The product of its (nonzero) digits is 4, while the sum is 6.

The square root of 20012001 is about 4473.4775063702. The cubic root of 20012001 is about 271.4960436800.

Adding to 20012001 its reverse (10021002), we get a palindrome (30033003).

Subtracting from 20012001 its reverse (10021002), we obtain a palindrome (9990999).

The spelling of 20012001 in words is "twenty million, twelve thousand, one".