20722528 has 12 divisors (see below), whose sum is σ = 40797540. Its totient is φ = 10361248.

The previous prime is 20722519. The next prime is 20722543. The reversal of 20722528 is 82522702.

It is a junction number, because it is equal to n+sod(n) for n = 20722496 and 20722505.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 323758 + ... + 323821.

It is an arithmetic number, because the mean of its divisors is an integer number (3399795).

Almost surely, 2^20722528 is an apocalyptic number.

It is an amenable number.

20722528 is a deficient number, since it is larger than the sum of its proper divisors (20075012).

20722528 is an equidigital number, since it uses as much as digits as its factorization.

20722528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647589 (or 647581 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20722528 is about 4552.2003470849. The cubic root of 20722528 is about 274.6719084472.

The spelling of 20722528 in words is "twenty million, seven hundred twenty-two thousand, five hundred twenty-eight".