20391107 has 8 divisors (see below), whose sum is σ = 22846512. Its totient is φ = 18036000.

The previous prime is 20391103. The next prime is 20391121. The reversal of 20391107 is 70119302.

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 20391107 - 2² = 20391103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20391101) 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, 24644 + ... + 25457.

It is an arithmetic number, because the mean of its divisors is an integer number (2855814).

Almost surely, 2^20391107 is an apocalyptic number.

20391107 is a deficient number, since it is larger than the sum of its proper divisors (2455405).

20391107 is a wasteful number, since it uses less digits than its factorization.

20391107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50149.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 20391107 is about 4515.6513372934. The cubic root of 20391107 is about 273.1997312903.

The spelling of 20391107 in words is "twenty million, three hundred ninety-one thousand, one hundred seven".