20068636 has 72 divisors (see below), whose sum is σ = 45677520. Its totient is φ = 7644672.

The previous prime is 20068603. The next prime is 20068669. The reversal of 20068636 is 63686002.

It is an interprime number because it is at equal distance from previous prime (20068603) and next prime (20068669).

It is a junction number, because it is equal to n+sod(n) for n = 20068598 and 20068607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63150 + ... + 63466.

It is an arithmetic number, because the mean of its divisors is an integer number (634410).

Almost surely, 2^20068636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20068636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22838760).

20068636 is an abundant number, since it is smaller than the sum of its proper divisors (25608884).

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

20068636 is a wasteful number, since it uses less digits than its factorization.

20068636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 20068636 is about 4479.8031206739. The cubic root of 20068636 is about 271.7519184102.

The spelling of 20068636 in words is "twenty million, sixty-eight thousand, six hundred thirty-six".