20728107 has 24 divisors (see below), whose sum is σ = 32260800. Its totient is φ = 12782448.

The previous prime is 20728093. The next prime is 20728109. The reversal of 20728107 is 70182702.

It is not a de Polignac number, because 20728107 - 2⁷ = 20727979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20728109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5944 + ... + 8762.

It is an arithmetic number, because the mean of its divisors is an integer number (1344200).

Almost surely, 2^20728107 is an apocalyptic number.

20728107 is a deficient number, since it is larger than the sum of its proper divisors (11532693).

20728107 is a wasteful number, since it uses less digits than its factorization.

20728107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887 (or 2884 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 20728107 is about 4552.8130864335. The cubic root of 20728107 is about 274.6965556505.

The spelling of 20728107 in words is "twenty million, seven hundred twenty-eight thousand, one hundred seven".