20628716 has 6 divisors (see below), whose sum is σ = 36100260. Its totient is φ = 10314356.

The previous prime is 20628709. The next prime is 20628731. The reversal of 20628716 is 61782602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2578586 + ... + 2578593.

It is an arithmetic number, because the mean of its divisors is an integer number (6016710).

Almost surely, 2^20628716 is an apocalyptic number.

It is an amenable number.

20628716 is a deficient number, since it is larger than the sum of its proper divisors (15471544).

20628716 is a wasteful number, since it uses less digits than its factorization.

20628716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5157183 (or 5157181 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20628716 is about 4541.8846308553. The cubic root of 20628716 is about 274.2567965648.

The spelling of 20628716 in words is "twenty million, six hundred twenty-eight thousand, seven hundred sixteen".