20723166 has 12 divisors (see below), whose sum is σ = 44900232. Its totient is φ = 6907716.

The previous prime is 20723137. The next prime is 20723173. The reversal of 20723166 is 66132702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 575626 + ... + 575661.

It is an arithmetic number, because the mean of its divisors is an integer number (3741686).

Almost surely, 2^20723166 is an apocalyptic number.

20723166 is an abundant number, since it is smaller than the sum of its proper divisors (24177066).

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

20723166 is a wasteful number, since it uses less digits than its factorization.

20723166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151295 (or 1151292 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 20723166 is about 4552.2704225474. The cubic root of 20723166 is about 274.6747272616.

Adding to 20723166 its reverse (66132702), we get a palindrome (86855868).

The spelling of 20723166 in words is "twenty million, seven hundred twenty-three thousand, one hundred sixty-six".