20681774 has 16 divisors (see below), whose sum is σ = 32417280. Its totient is φ = 9884280.

The previous prime is 20681723. The next prime is 20681777. The reversal of 20681774 is 47718602.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20681777) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3137 + ... + 7155.

It is an arithmetic number, because the mean of its divisors is an integer number (2026080).

Almost surely, 2^20681774 is an apocalyptic number.

20681774 is a deficient number, since it is larger than the sum of its proper divisors (11735506).

20681774 is a wasteful number, since it uses less digits than its factorization.

20681774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4135.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 20681774 is about 4547.7218472550. The cubic root of 20681774 is about 274.4917289311.

The spelling of 20681774 in words is "twenty million, six hundred eighty-one thousand, seven hundred seventy-four".