20728124 has 24 divisors (see below), whose sum is σ = 37570848. Its totient is φ = 9999360.

The previous prime is 20728121. The next prime is 20728133. The reversal of 20728124 is 42182702.

It is a junction number, because it is equal to n+sod(n) for n = 20728093 and 20728102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20728121) 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, 15257 + ... + 16559.

It is an arithmetic number, because the mean of its divisors is an integer number (1565452).

Almost surely, 2^20728124 is an apocalyptic number.

It is an amenable number.

20728124 is a deficient number, since it is larger than the sum of its proper divisors (16842724).

20728124 is a wasteful number, since it uses less digits than its factorization.

20728124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445 (or 1443 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 20728124 is about 4552.8149534107. The cubic root of 20728124 is about 274.6966307472.

The spelling of 20728124 in words is "twenty million, seven hundred twenty-eight thousand, one hundred twenty-four".