20728332 has 24 divisors (see below), whose sum is σ = 53740400. Its totient is φ = 6909408.

The previous prime is 20728291. The next prime is 20728339. The reversal of 20728332 is 23382702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20728296 and 20728305.

It is not an unprimeable number, because it can be changed into a prime (20728339) 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, 95857 + ... + 96072.

Almost surely, 2^20728332 is an apocalyptic number.

It is an amenable number.

20728332 is an abundant number, since it is smaller than the sum of its proper divisors (33012068).

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

20728332 is a wasteful number, since it uses less digits than its factorization.

20728332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191942 (or 191934 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 20728332 is about 4552.8377963639. The cubic root of 20728332 is about 274.6975495747.

It can be divided in two parts, 2072 and 8332, that added together give a square (10404 = 102²).

The spelling of 20728332 in words is "twenty million, seven hundred twenty-eight thousand, three hundred thirty-two".