20247489 has 24 divisors (see below), whose sum is σ = 30677920. Its totient is φ = 13343616.

The previous prime is 20247457. The next prime is 20247509. The reversal of 20247489 is 98474202.

It is not a de Polignac number, because 20247489 - 2⁵ = 20247457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20247419) 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 23 ways as a sum of consecutive naturals, for example, 23142 + ... + 24000.

Almost surely, 2^20247489 is an apocalyptic number.

It is an amenable number.

20247489 is a deficient number, since it is larger than the sum of its proper divisors (10430431).

20247489 is an frugal number, since it uses more digits than its factorization.

20247489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20247489 is about 4499.7209913505. The cubic root of 20247489 is about 272.5568223114.

It can be divided in two parts, 20247 and 489, that added together give a 4-th power (20736 = 12⁴).

The spelling of 20247489 in words is "twenty million, two hundred forty-seven thousand, four hundred eighty-nine".