20345628 has 24 divisors (see below), whose sum is σ = 47692288. Its totient is φ = 6750576.

The previous prime is 20345621. The next prime is 20345629. The reversal of 20345628 is 82654302.

It is a Smith number, since the sum of its digits (30) 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 = 20345595 and 20345604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345621) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 1126 + ... + 6477.

Almost surely, 2^20345628 is an apocalyptic number.

It is an amenable number.

20345628 is an abundant number, since it is smaller than the sum of its proper divisors (27346660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20345628 is a wasteful number, since it uses less digits than its factorization.

20345628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7833 (or 7831 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 20345628 is about 4510.6128186755. The cubic root of 20345628 is about 272.9964711267.

The spelling of 20345628 in words is "twenty million, three hundred forty-five thousand, six hundred twenty-eight".