20724366 has 64 divisors (see below), whose sum is σ = 47190528. Its totient is φ = 6023808.

The previous prime is 20724359. The next prime is 20724367. The reversal of 20724366 is 66342702.

It is a super-2 number, since 2×20724366² = 858998692203912, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20724367) 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 31 ways as a sum of consecutive naturals, for example, 124015 + ... + 124181.

It is an arithmetic number, because the mean of its divisors is an integer number (737352).

Almost surely, 2^20724366 is an apocalyptic number.

20724366 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 20724366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23595264).

20724366 is an abundant number, since it is smaller than the sum of its proper divisors (26466162).

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

20724366 is a wasteful number, since it uses less digits than its factorization.

20724366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 20724366 is about 4552.4022230027. The cubic root of 20724366 is about 274.6800289501.

The spelling of 20724366 in words is "twenty million, seven hundred twenty-four thousand, three hundred sixty-six".