20541909 has 8 divisors (see below), whose sum is σ = 27414720. Its totient is φ = 13681856.

The previous prime is 20541901. The next prime is 20541949. The reversal of 20541909 is 90914502.

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 20541909 - 2³ = 20541901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20541901) 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, 1597 + ... + 6605.

It is an arithmetic number, because the mean of its divisors is an integer number (3426840).

Almost surely, 2^20541909 is an apocalyptic number.

It is an amenable number.

20541909 is a deficient number, since it is larger than the sum of its proper divisors (6872811).

20541909 is a wasteful number, since it uses less digits than its factorization.

20541909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6379.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20541909 is about 4532.3182809684. The cubic root of 20541909 is about 273.8715587825.

The spelling of 20541909 in words is "twenty million, five hundred forty-one thousand, nine hundred nine".