20728527 has 16 divisors (see below), whose sum is σ = 28227072. Its totient is φ = 13527360.

The previous prime is 20728517. The next prime is 20728531. The reversal of 20728527 is 72582702.

It is not a de Polignac number, because 20728527 - 2⁸ = 20728271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56298 + ... + 56664.

It is an arithmetic number, because the mean of its divisors is an integer number (1764192).

Almost surely, 2^20728527 is an apocalyptic number.

20728527 is a deficient number, since it is larger than the sum of its proper divisors (7498545).

20728527 is a wasteful number, since it uses less digits than its factorization.

20728527 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718.

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 20728527 is about 4552.8592115285. The cubic root of 20728527 is about 274.6984109698.

The spelling of 20728527 in words is "twenty million, seven hundred twenty-eight thousand, five hundred twenty-seven".