20010001 has 8 divisors (see below), whose sum is σ = 22137408. Its totient is φ = 17934000.

The previous prime is 20009999. The next prime is 20010017. The reversal of 20010001 is 10001002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20010001 - 2¹ = 20009999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20010041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12030 + ... + 13591.

It is an arithmetic number, because the mean of its divisors is an integer number (2767176).

Almost surely, 2^20010001 is an apocalyptic number.

20010001 is the 2001-st centered decagonal number.

It is an amenable number.

20010001 is a deficient number, since it is larger than the sum of its proper divisors (2127407).

20010001 is a wasteful number, since it uses less digits than its factorization.

20010001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25703.

The product of its (nonzero) digits is 2, while the sum is 4.

The square root of 20010001 is about 4473.2539610445. The cubic root of 20010001 is about 271.4869989377.

Adding to 20010001 its reverse (10001002), we get a palindrome (30011003).

Multiplying 20010001 by its reverse (10001002), we get a palindrome (200120060021002).

It can be divided in two parts, 200 and 10001, that added together give a palindrome (10201).

The spelling of 20010001 in words is "twenty million, ten thousand, one".