20027489 has 4 divisors (see below), whose sum is σ = 20081556. Its totient is φ = 19973424.

The previous prime is 20027461. The next prime is 20027507. The reversal of 20027489 is 98472002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98472002 = 2 ⋅49236001.

It can be written as a sum of positive squares in 2 ways, for example, as 7246864 + 12780625 = 2692^2 + 3575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20027489 is a prime.

It is a super-2 number, since 2×20027489² = 802200631290242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20027419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26474 + ... + 27219.

It is an arithmetic number, because the mean of its divisors is an integer number (5020389).

Almost surely, 2^20027489 is an apocalyptic number.

It is an amenable number.

20027489 is a deficient number, since it is larger than the sum of its proper divisors (54067).

20027489 is an equidigital number, since it uses as much as digits as its factorization.

20027489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54066.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 20027489 is about 4475.2082633102. The cubic root of 20027489 is about 271.5660657700.

The spelling of 20027489 in words is "twenty million, twenty-seven thousand, four hundred eighty-nine".