20668628 has 24 divisors (see below), whose sum is σ = 37927680. Its totient is φ = 9836640.

The previous prime is 20668589. The next prime is 20668631. The reversal of 20668628 is 82686602.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20668591 and 20668600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24518 + ... + 25346.

It is an arithmetic number, because the mean of its divisors is an integer number (1580320).

Almost surely, 2^20668628 is an apocalyptic number.

It is an amenable number.

20668628 is a deficient number, since it is larger than the sum of its proper divisors (17259052).

20668628 is a wasteful number, since it uses less digits than its factorization.

20668628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127 (or 1125 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 20668628 is about 4546.2762784503. The cubic root of 20668628 is about 274.4335580170.

The spelling of 20668628 in words is "twenty million, six hundred sixty-eight thousand, six hundred twenty-eight".