20728596 has 24 divisors (see below), whose sum is σ = 55276480. Its totient is φ = 5922432.

The previous prime is 20728583. The next prime is 20728597. The reversal of 20728596 is 69582702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728597) 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 7 ways as a sum of consecutive naturals, for example, 123301 + ... + 123468.

Almost surely, 2^20728596 is an apocalyptic number.

It is an amenable number.

20728596 is an abundant number, since it is smaller than the sum of its proper divisors (34547884).

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

20728596 is a wasteful number, since it uses less digits than its factorization.

20728596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246783 (or 246781 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 20728596 is about 4552.8667891780. The cubic root of 20728596 is about 274.6987157699.

The spelling of 20728596 in words is "twenty million, seven hundred twenty-eight thousand, five hundred ninety-six".