20487609 has 6 divisors (see below), whose sum is σ = 29593226. Its totient is φ = 13658400.

The previous prime is 20487589. The next prime is 20487613. The reversal of 20487609 is 90678402.

20487609 is a `hidden beast` number, since 2 + 0 + 48 + 7 + 609 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17665209 + 2822400 = 4203^2 + 1680^2 .

It is not a de Polignac number, because 20487609 - 2¹² = 20483513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20487619) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1138192 + ... + 1138209.

Almost surely, 2^20487609 is an apocalyptic number.

It is an amenable number.

20487609 is a deficient number, since it is larger than the sum of its proper divisors (9105617).

20487609 is a wasteful number, since it uses less digits than its factorization.

20487609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276407 (or 2276404 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 20487609 is about 4526.3240051945. The cubic root of 20487609 is about 273.6300306244.

The spelling of 20487609 in words is "twenty million, four hundred eighty-seven thousand, six hundred nine".