20118428 has 36 divisors (see below), whose sum is σ = 39079656. Its totient is φ = 9055200.

The previous prime is 20118421. The next prime is 20118433. The reversal of 20118428 is 82481102.

It is a super-2 number, since 2×20118428² = 809502290382368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20118397 and 20118406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20118421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95243 + ... + 95453.

It is an arithmetic number, because the mean of its divisors is an integer number (1085546).

Almost surely, 2^20118428 is an apocalyptic number.

It is an amenable number.

20118428 is a deficient number, since it is larger than the sum of its proper divisors (18961228).

20118428 is a wasteful number, since it uses less digits than its factorization.

20118428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 20118428 is about 4485.3570649392. The cubic root of 20118428 is about 271.9764793675.

The spelling of 20118428 in words is "twenty million, one hundred eighteen thousand, four hundred twenty-eight".