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20478155 = 59742223
BaseRepresentation
bin100111000011…
…1100011001011
31102112101202012
41032013203023
520220300110
62010530135
7336030035
oct116074313
942471665
1020478155
11106175a5
126a3694b
13431cc69
142a10c55
151be7905
hex13878cb

20478155 has 8 divisors (see below), whose sum is σ = 24827712. Its totient is φ = 16213248.

The previous prime is 20478121. The next prime is 20478173. The reversal of 20478155 is 55187402.

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 20478155 - 26 = 20478091 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20627 + ... + 21596.

It is an arithmetic number, because the mean of its divisors is an integer number (3103464).

Almost surely, 220478155 is an apocalyptic number.

20478155 is a deficient number, since it is larger than the sum of its proper divisors (4349557).

20478155 is an equidigital number, since it uses as much as digits as its factorization.

20478155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42325.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 20478155 is about 4525.2795493759. The cubic root of 20478155 is about 273.5879353215.

The spelling of 20478155 in words is "twenty million, four hundred seventy-eight thousand, one hundred fifty-five".

Divisors: 1 5 97 485 42223 211115 4095631 20478155