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20863345 = 517923311
BaseRepresentation
bin100111110010…
…1100101110001
31110020222010111
41033211211301
520320111340
62023101321
7342223036
oct117454561
943228114
1020863345
111085aa38
126ba1841
134426399
142ab138d
151c71aea
hex13e5971

20863345 has 8 divisors (see below), whose sum is σ = 25176960. Its totient is φ = 16596720.

The previous prime is 20863321. The next prime is 20863351. The reversal of 20863345 is 54336802.

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

It is not a de Polignac number, because 20863345 - 25 = 20863313 is a prime.

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, 10761 + ... + 12550.

It is an arithmetic number, because the mean of its divisors is an integer number (3147120).

Almost surely, 220863345 is an apocalyptic number.

It is an amenable number.

20863345 is a deficient number, since it is larger than the sum of its proper divisors (4313615).

20863345 is a wasteful number, since it uses less digits than its factorization.

20863345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23495.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20863345 is about 4567.6410760917. The cubic root of 20863345 is about 275.2926691322.

The spelling of 20863345 in words is "twenty million, eight hundred sixty-three thousand, three hundred forty-five".

Divisors: 1 5 179 895 23311 116555 4172669 20863345