20489409 has 8 divisors (see below), whose sum is σ = 30354720. Its totient is φ = 13659588.

The previous prime is 20489387. The next prime is 20489423. The reversal of 20489409 is 90498402.

It is a happy number.

It is not a de Polignac number, because 20489409 - 2⁵ = 20489377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20489479) 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, 379407 + ... + 379460.

It is an arithmetic number, because the mean of its divisors is an integer number (3794340).

Almost surely, 2^20489409 is an apocalyptic number.

It is an amenable number.

20489409 is a deficient number, since it is larger than the sum of its proper divisors (9865311).

20489409 is an equidigital number, since it uses as much as digits as its factorization.

20489409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758876 (or 758870 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 20489409 is about 4526.5228376757. The cubic root of 20489409 is about 273.6380439172.

The spelling of 20489409 in words is "twenty million, four hundred eighty-nine thousand, four hundred nine".