20681466 has 64 divisors (see below), whose sum is σ = 47416320. Its totient is φ = 5967360.

The previous prime is 20681459. The next prime is 20681471. The reversal of 20681466 is 66418602.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92631 + ... + 92853.

It is an arithmetic number, because the mean of its divisors is an integer number (740880).

Almost surely, 2^20681466 is an apocalyptic number.

20681466 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 20681466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23708160).

20681466 is an abundant number, since it is smaller than the sum of its proper divisors (26734854).

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

20681466 is a wasteful number, since it uses less digits than its factorization.

20681466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 20681466 is about 4547.6879840200. The cubic root of 20681466 is about 274.4903663163.

The spelling of 20681466 in words is "twenty million, six hundred eighty-one thousand, four hundred sixty-six".