20680236 has 36 divisors (see below), whose sum is σ = 53553864. Its totient is φ = 6724800.

The previous prime is 20680217. The next prime is 20680249. The reversal of 20680236 is 63208602.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×20680236² = 855344322031392, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5530 + ... + 8481.

Almost surely, 2^20680236 is an apocalyptic number.

It is an amenable number.

20680236 is an abundant number, since it is smaller than the sum of its proper divisors (32873628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20680236 is a wasteful number, since it uses less digits than its factorization.

20680236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14062 (or 14057 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20680236 is about 4547.5527484571. The cubic root of 20680236 is about 274.4849245705.

Adding to 20680236 its reverse (63208602), we get a palindrome (83888838).

The spelling of 20680236 in words is "twenty million, six hundred eighty thousand, two hundred thirty-six".