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20512055 = 512973163
BaseRepresentation
bin100111000111…
…1110100110111
31102121010020202
41032033310313
520222341210
62011351115
7336230624
oct116176467
942533222
1020512055
1110640013
126a5249b
134332515
142a1d34b
151c029a5
hex138fd37

20512055 has 8 divisors (see below), whose sum is σ = 24641232. Its totient is φ = 16391808.

The previous prime is 20512031. The next prime is 20512073. The reversal of 20512055 is 55021502.

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 20512055 - 210 = 20511031 is a prime.

It is a Duffinian number.

It is a congruent 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, 4904 + ... + 8066.

It is an arithmetic number, because the mean of its divisors is an integer number (3080154).

Almost surely, 220512055 is an apocalyptic number.

20512055 is a deficient number, since it is larger than the sum of its proper divisors (4129177).

20512055 is a wasteful number, since it uses less digits than its factorization.

20512055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4465.

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 20512055 is about 4529.0236254628. The cubic root of 20512055 is about 273.7388199739.

Adding to 20512055 its reverse (55021502), we get a palindrome (75533557).

The spelling of 20512055 in words is "twenty million, five hundred twelve thousand, fifty-five".

Divisors: 1 5 1297 3163 6485 15815 4102411 20512055