20120001 has 24 divisors (see below), whose sum is σ = 30196320. Its totient is φ = 11901120.

The previous prime is 20119991. The next prime is 20120029. The reversal of 20120001 is 10002102.

It is a happy number.

It is not a de Polignac number, because 20120001 - 2⁵ = 20119969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14965 + ... + 16253.

It is an arithmetic number, because the mean of its divisors is an integer number (1258180).

Almost surely, 2^20120001 is an apocalyptic number.

It is an amenable number.

20120001 is a deficient number, since it is larger than the sum of its proper divisors (10076319).

20120001 is a wasteful number, since it uses less digits than its factorization.

20120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357 (or 1346 counting only the distinct ones).

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

The square root of 20120001 is about 4485.5324098706. The cubic root of 20120001 is about 271.9835675266.

Adding to 20120001 its reverse (10002102), we get a palindrome (30122103).

It can be divided in two parts, 201 and 20001, that added together give a palindrome (20202).

The spelling of 20120001 in words is "twenty million, one hundred twenty thousand, one".