20712628 has 12 divisors (see below), whose sum is σ = 36352260. Its totient is φ = 10326272.

The previous prime is 20712607. The next prime is 20712631. The reversal of 20712628 is 82621702.

It can be written as a sum of positive squares in 2 ways, for example, as 10903204 + 9809424 = 3302^2 + 3132^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20712596 and 20712605.

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 in 3 ways as a sum of consecutive naturals, for example, 5923 + ... + 8746.

It is an arithmetic number, because the mean of its divisors is an integer number (3029355).

Almost surely, 2^20712628 is an apocalyptic number.

It is an amenable number.

20712628 is a deficient number, since it is larger than the sum of its proper divisors (15639632).

20712628 is a wasteful number, since it uses less digits than its factorization.

20712628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15026 (or 15024 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20712628 is about 4551.1128309459. The cubic root of 20712628 is about 274.6281608079.

The spelling of 20712628 in words is "twenty million, seven hundred twelve thousand, six hundred twenty-eight".