20009901 has 8 divisors (see below), whose sum is σ = 28249344. Its totient is φ = 12555200.

The previous prime is 20009887. The next prime is 20009917. The reversal of 20009901 is 10990002.

It is a happy number.

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 20009901 - 2⁹ = 20009389 is a prime.

It is a super-2 number, since 2×20009901² = 800792276059602, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20009981) 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 7 ways as a sum of consecutive naturals, for example, 196125 + ... + 196226.

It is an arithmetic number, because the mean of its divisors is an integer number (3531168).

Almost surely, 2^20009901 is an apocalyptic number.

It is an amenable number.

20009901 is a deficient number, since it is larger than the sum of its proper divisors (8239443).

20009901 is a wasteful number, since it uses less digits than its factorization.

20009901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392371.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 20009901 is about 4473.2427834849. The cubic root of 20009901 is about 271.4865466847.

Adding to 20009901 its reverse (10990002), we get a palindrome (30999903).

It can be divided in two parts, 20009 and 901, that added together give a triangular number (20910 = T₂₀₄).

The spelling of 20009901 in words is "twenty million, nine thousand, nine hundred one".