20381766 has 16 divisors (see below), whose sum is σ = 41076288. Its totient is φ = 6741800.

The previous prime is 20381761. The next prime is 20381789. The reversal of 20381766 is 66718302.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20381761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12180 + ... + 13751.

It is an arithmetic number, because the mean of its divisors is an integer number (2567268).

Almost surely, 2^20381766 is an apocalyptic number.

20381766 is an abundant number, since it is smaller than the sum of its proper divisors (20694522).

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

20381766 is a wasteful number, since it uses less digits than its factorization.

20381766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26067.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20381766 is about 4514.6169272708. The cubic root of 20381766 is about 273.1580080615.

The spelling of 20381766 in words is "twenty million, three hundred eighty-one thousand, seven hundred sixty-six".