20727408 has 80 divisors (see below), whose sum is σ = 58746240. Its totient is φ = 6258432.

The previous prime is 20727397. The next prime is 20727409. The reversal of 20727408 is 80472702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20727409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36535 + ... + 37097.

It is an arithmetic number, because the mean of its divisors is an integer number (734328).

Almost surely, 2^20727408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20727408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29373120).

20727408 is an abundant number, since it is smaller than the sum of its proper divisors (38018832).

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

20727408 is a wasteful number, since it uses less digits than its factorization.

20727408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 20727408 is about 4552.7363200607. The cubic root of 20727408 is about 274.6934678134.

The spelling of 20727408 in words is "twenty million, seven hundred twenty-seven thousand, four hundred eight".