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20555706065505 = 3513389270986831
BaseRepresentation
bin1001010110001111111111…
…00011101110001001100001
32200210002212111110112212120
410223013333203232021201
510143241041223044010
6111415054435414453
74221046362444432
oct453077743561141
980702774415776
1020555706065505
116605698207aa6
12237ba00454429
13b615193b4240
14510c89949489
15259a7b284e70
hex12b1ff8ee261

20555706065505 has 32 divisors (see below), whose sum is σ = 35510114465280. Its totient is φ = 10093717443840.

The previous prime is 20555706065501. The next prime is 20555706065513. The reversal of 20555706065505 is 50556060755502.

It is not a de Polignac number, because 20555706065505 - 22 = 20555706065501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555706065501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135417561 + ... + 135569270.

It is an arithmetic number, because the mean of its divisors is an integer number (1109691077040).

Almost surely, 220555706065505 is an apocalyptic number.

It is an amenable number.

20555706065505 is a deficient number, since it is larger than the sum of its proper divisors (14954408399775).

20555706065505 is a wasteful number, since it uses less digits than its factorization.

20555706065505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270987241.

The product of its (nonzero) digits is 7875000, while the sum is 51.

The spelling of 20555706065505 in words is "twenty trillion, five hundred fifty-five billion, seven hundred six million, sixty-five thousand, five hundred five".

Divisors: 1 3 5 13 15 39 65 195 389 1167 1945 5057 5835 15171 25285 75855 270986831 812960493 1354934155 3522828803 4064802465 10568486409 17614144015 52842432045 105413877259 316241631777 527069386295 1370380404367 1581208158885 4111141213101 6851902021835 20555706065505