20728102 has 8 divisors (see below), whose sum is σ = 31113576. Its totient is φ = 10356912.

The previous prime is 20728093. The next prime is 20728109. The reversal of 20728102 is 20182702.

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

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1498 + ... + 6610.

It is an arithmetic number, because the mean of its divisors is an integer number (3889197).

Almost surely, 2^20728102 is an apocalyptic number.

20728102 is a deficient number, since it is larger than the sum of its proper divisors (10385474).

20728102 is a wasteful number, since it uses less digits than its factorization.

20728102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7142.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 20728102 is about 4552.8125373224. The cubic root of 20728102 is about 274.6965335632.

The spelling of 20728102 in words is "twenty million, seven hundred twenty-eight thousand, one hundred two".