20340691 has 8 divisors (see below), whose sum is σ = 23281664. Its totient is φ = 17408520.

The previous prime is 20340689. The next prime is 20340709. The reversal of 20340691 is 19604302.

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 20340691 - 2¹ = 20340689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20340601) 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, 3886 + ... + 7468.

It is an arithmetic number, because the mean of its divisors is an integer number (2910208).

Almost surely, 2^20340691 is an apocalyptic number.

20340691 is a deficient number, since it is larger than the sum of its proper divisors (2940973).

20340691 is an equidigital number, since it uses as much as digits as its factorization.

20340691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4401.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20340691 is about 4510.0655205884. The cubic root of 20340691 is about 272.9743878793.

Adding to 20340691 its reverse (19604302), we get a palindrome (39944993).

The spelling of 20340691 in words is "twenty million, three hundred forty thousand, six hundred ninety-one".