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20623305 = 351374887
BaseRepresentation
bin100111010101…
…0111111001001
31102210202212010
41032222333021
520234421210
62014010133
7340203153
oct116527711
942722763
1020623305
111070665a
126aa6949
134371051
142a4bad3
151c25920
hex13aafc9

20623305 has 8 divisors (see below), whose sum is σ = 32997312. Its totient is φ = 10999088.

The previous prime is 20623301. The next prime is 20623313. The reversal of 20623305 is 50332602.

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

It is a cyclic number.

It is not a de Polignac number, because 20623305 - 22 = 20623301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20623301) 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, 687429 + ... + 687458.

It is an arithmetic number, because the mean of its divisors is an integer number (4124664).

Almost surely, 220623305 is an apocalyptic number.

It is an amenable number.

20623305 is a deficient number, since it is larger than the sum of its proper divisors (12374007).

20623305 is a wasteful number, since it uses less digits than its factorization.

20623305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1374895.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20623305 is about 4541.2889139538. The cubic root of 20623305 is about 274.2328148929.

Adding to 20623305 its reverse (50332602), we get a palindrome (70955907).

The spelling of 20623305 in words is "twenty million, six hundred twenty-three thousand, three hundred five".

Divisors: 1 3 5 15 1374887 4124661 6874435 20623305