20224809 has 20 divisors (see below), whose sum is σ = 32960400. Its totient is φ = 12256920.

The previous prime is 20224801. The next prime is 20224811. The reversal of 20224809 is 90842202.

It is not a de Polignac number, because 20224809 - 2³ = 20224801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20224801) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10459 + ... + 12240.

It is an arithmetic number, because the mean of its divisors is an integer number (1648020).

Almost surely, 2^20224809 is an apocalyptic number.

It is an amenable number.

20224809 is a deficient number, since it is larger than the sum of its proper divisors (12735591).

20224809 is a wasteful number, since it uses less digits than its factorization.

20224809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22722 (or 22713 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20224809 is about 4497.2001289691. The cubic root of 20224809 is about 272.4550171239.

The spelling of 20224809 in words is "twenty million, two hundred twenty-four thousand, eight hundred nine".