20728103 has 8 divisors (see below), whose sum is σ = 23224080. Its totient is φ = 18334080.

The previous prime is 20728093. The next prime is 20728109. The reversal of 20728103 is 30182702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20728103 - 2⁴ = 20728087 is a prime.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 25058 + ... + 25871.

It is an arithmetic number, because the mean of its divisors is an integer number (2903010).

Almost surely, 2^20728103 is an apocalyptic number.

20728103 is a deficient number, since it is larger than the sum of its proper divisors (2495977).

20728103 is a wasteful number, since it uses less digits than its factorization.

20728103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50977.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 20728103 is about 4552.8126471446. The cubic root of 20728103 is about 274.6965379806.

The spelling of 20728103 in words is "twenty million, seven hundred twenty-eight thousand, one hundred three".