20345686 has 4 divisors (see below), whose sum is σ = 30518532. Its totient is φ = 10172842.

The previous prime is 20345683. The next prime is 20345687. The reversal of 20345686 is 68654302.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5086420 + ... + 5086423.

It is an arithmetic number, because the mean of its divisors is an integer number (7629633).

Almost surely, 2^20345686 is an apocalyptic number.

20345686 is a deficient number, since it is larger than the sum of its proper divisors (10172846).

20345686 is a wasteful number, since it uses less digits than its factorization.

20345686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10172845.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 20345686 is about 4510.6192479525. The cubic root of 20345686 is about 272.9967305400.

Adding to 20345686 its reverse (68654302), we get a palindrome (88999988).

The spelling of 20345686 in words is "twenty million, three hundred forty-five thousand, six hundred eighty-six".