20284609 has 4 divisors (see below), whose sum is σ = 21352240. Its totient is φ = 19216980.

The previous prime is 20284603. The next prime is 20284639. The reversal of 20284609 is 90648202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20284609 - 2¹⁵ = 20251841 is a prime.

It is a super-2 number, since 2×20284609² = 822930724565762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20284603) 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, 533787 + ... + 533824.

It is an arithmetic number, because the mean of its divisors is an integer number (5338060).

Almost surely, 2^20284609 is an apocalyptic number.

It is an amenable number.

20284609 is a deficient number, since it is larger than the sum of its proper divisors (1067631).

20284609 is a wasteful number, since it uses less digits than its factorization.

20284609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1067630.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 20284609 is about 4503.8438027978. The cubic root of 20284609 is about 272.7232813524.

The spelling of 20284609 in words is "twenty million, two hundred eighty-four thousand, six hundred nine".