20813628 has 24 divisors (see below), whose sum is σ = 52980480. Its totient is φ = 6307120.

The previous prime is 20813623. The next prime is 20813669. The reversal of 20813628 is 82631802.

It is a super-2 number, since 2×20813628² = 866414221044768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20813595 and 20813604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20813623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78708 + ... + 78971.

It is an arithmetic number, because the mean of its divisors is an integer number (2207520).

Almost surely, 2^20813628 is an apocalyptic number.

It is an amenable number.

20813628 is an abundant number, since it is smaller than the sum of its proper divisors (32166852).

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

20813628 is a wasteful number, since it uses less digits than its factorization.

20813628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157697 (or 157695 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 20813628 is about 4562.1955240871. The cubic root of 20813628 is about 275.0738226051.

The spelling of 20813628 in words is "twenty million, eight hundred thirteen thousand, six hundred twenty-eight".