20028547 has 8 divisors (see below), whose sum is σ = 24970752. Its totient is φ = 15606600.

The previous prime is 20028529. The next prime is 20028559. The reversal of 20028547 is 74582002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20028547 - 2¹¹ = 20026499 is a prime.

It is a super-2 number, since 2×20028547² = 802285389862418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20028517) 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, 129979 + ... + 130132.

It is an arithmetic number, because the mean of its divisors is an integer number (3121344).

Almost surely, 2^20028547 is an apocalyptic number.

20028547 is a deficient number, since it is larger than the sum of its proper divisors (4942205).

20028547 is a wasteful number, since it uses less digits than its factorization.

20028547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260129.

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 20028547 is about 4475.3264685384. The cubic root of 20028547 is about 271.5708477281.

The spelling of 20028547 in words is "twenty million, twenty-eight thousand, five hundred forty-seven".