20091901 has 8 divisors (see below), whose sum is σ = 20506304. Its totient is φ = 19681920.

The previous prime is 20091881. The next prime is 20091913. The reversal of 20091901 is 10919002.

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 20091901 - 2⁹ = 20091389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20091931) 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, 8986 + ... + 10996.

It is an arithmetic number, because the mean of its divisors is an integer number (2563288).

Almost surely, 2^20091901 is an apocalyptic number.

It is an amenable number.

20091901 is a deficient number, since it is larger than the sum of its proper divisors (414403).

20091901 is a wasteful number, since it uses less digits than its factorization.

20091901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 20091901 is about 4482.3990228448. The cubic root of 20091901 is about 271.8568892855.

The spelling of 20091901 in words is "twenty million, ninety-one thousand, nine hundred one".