20728326 has 16 divisors (see below), whose sum is σ = 42076224. Its totient is φ = 6806184.

The previous prime is 20728291. The next prime is 20728339. The reversal of 20728326 is 62382702.

It is a junction number, because it is equal to n+sod(n) for n = 20728293 and 20728302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25380 + ... + 26183.

It is an arithmetic number, because the mean of its divisors is an integer number (2629764).

Almost surely, 2^20728326 is an apocalyptic number.

20728326 is an abundant number, since it is smaller than the sum of its proper divisors (21347898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20728326 is a wasteful number, since it uses less digits than its factorization.

20728326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51635.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 20728326 is about 4552.8371374342. The cubic root of 20728326 is about 274.6975230701.

The spelling of 20728326 in words is "twenty million, seven hundred twenty-eight thousand, three hundred twenty-six".