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20102105555 = 572010128573
BaseRepresentation
bin10010101110001011…
…011100100111010011
31220212221122202201222
4102232023130213103
5312132114334210
613122413515255
71311102035510
oct225613344723
956787582658
1020102105555
118586129484
123a901a2b2b
131b848a791c
14d89aa4307
157c9bd9655
hex4ae2dc9d3

20102105555 has 16 divisors (see below), whose sum is σ = 27570938304. Its totient is φ = 13783132800.

The previous prime is 20102105509. The next prime is 20102105591. The reversal of 20102105555 is 55550120102.

It is not a de Polignac number, because 20102105555 - 224 = 20085328339 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 689249 + ... + 717821.

It is an arithmetic number, because the mean of its divisors is an integer number (1723183644).

Almost surely, 220102105555 is an apocalyptic number.

20102105555 is a deficient number, since it is larger than the sum of its proper divisors (7468832749).

20102105555 is a wasteful number, since it uses less digits than its factorization.

20102105555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48686.

The product of its (nonzero) digits is 2500, while the sum is 26.

Adding to 20102105555 its reverse (55550120102), we get a palindrome (75652225657).

The spelling of 20102105555 in words is "twenty billion, one hundred two million, one hundred five thousand, five hundred fifty-five".

Divisors: 1 5 7 35 20101 28573 100505 140707 142865 200011 703535 1000055 574345873 2871729365 4020421111 20102105555