20681712 has 120 divisors (see below), whose sum is σ = 61746048. Its totient is φ = 6451200.

The previous prime is 20681711. The next prime is 20681719. The reversal of 20681712 is 21718602.

It is a super-2 number, since 2×20681712² = 855466422501888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182968 + ... + 183080.

Almost surely, 2^20681712 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 20681712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30873024).

20681712 is an abundant number, since it is smaller than the sum of its proper divisors (41064336).

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

20681712 is a wasteful number, since it uses less digits than its factorization.

20681712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 20681712 is about 4547.7150306500. The cubic root of 20681712 is about 274.4914546396.

It can be divided in two parts, 206 and 81712, that added together give a palindrome (81918).

The spelling of 20681712 in words is "twenty million, six hundred eighty-one thousand, seven hundred twelve".