20715628 has 24 divisors (see below), whose sum is σ = 37875600.
Its totient is φ = 9901248.
The previous prime is 20715623. The next prime is 20715641. The reversal of 20715628 is 82651702.
It is a self number, because there is not a number n which added to its sum of digits gives 20715628.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20715623) by changing a digit.
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 7 ways as a sum of consecutive naturals, for example, 11578 + ... + 13246.
It is an arithmetic number, because the mean of its divisors is an integer number (1578150).
Almost surely, 220715628 is an apocalyptic number.
It is an amenable number.
20715628 is a deficient number, since it is larger than the sum of its proper divisors (17159972).
20715628 is a wasteful number, since it uses less digits than its factorization.
20715628 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1809 (or 1807 counting only the distinct ones).
The product of its (nonzero) digits is 6720, while the sum is 31.
The square root of 20715628 is about 4551.4424087315.
The cubic root of 20715628 is about 274.6414191401.
The spelling of 20715628 in words is "twenty million, seven hundred fifteen thousand, six hundred twenty-eight".