20424505 has 8 divisors (see below), whose sum is σ = 25300224. Its totient is φ = 15812400.

The previous prime is 20424493. The next prime is 20424511. The reversal of 20424505 is 50542402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20424505 - 2⁷ = 20424377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65731 + ... + 66040.

It is an arithmetic number, because the mean of its divisors is an integer number (3162528).

Almost surely, 2^20424505 is an apocalyptic number.

It is an amenable number.

20424505 is a deficient number, since it is larger than the sum of its proper divisors (4875719).

20424505 is a wasteful number, since it uses less digits than its factorization.

20424505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131807.

The product of its (nonzero) digits is 1600, while the sum is 22.

The square root of 20424505 is about 4519.3478511838. The cubic root of 20424505 is about 273.3488052251.

Adding to 20424505 its reverse (50542402), we get a palindrome (70966907).

The spelling of 20424505 in words is "twenty million, four hundred twenty-four thousand, five hundred five".