20307091 has 8 divisors (see below), whose sum is σ = 24217344. Its totient is φ = 16649160.

The previous prime is 20307071. The next prime is 20307103. The reversal of 20307091 is 19070302.

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 20307091 - 2⁵ = 20307059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20307071) 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, 62905 + ... + 63226.

It is an arithmetic number, because the mean of its divisors is an integer number (3027168).

Almost surely, 2^20307091 is an apocalyptic number.

20307091 is a deficient number, since it is larger than the sum of its proper divisors (3910253).

20307091 is a wasteful number, since it uses less digits than its factorization.

20307091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126161.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 20307091 is about 4506.3389797040. The cubic root of 20307091 is about 272.8239997676.

Adding to 20307091 its reverse (19070302), we get a palindrome (39377393).

The spelling of 20307091 in words is "twenty million, three hundred seven thousand, ninety-one".