19990555

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{79}}^1\times {\mathrm{229}}^1$

素因数の和:343

約数の個数: 32

約数和(自身を含む): 27820800

約数和(自身を除く): 7830245

約数列:

[1, 5, 13, 17, 65, 79, 85, 221, 229, 395, 1027, 1105, 1145, 1343, 2977, 3893, 5135, 6715, 14885, 17459, 18091, 19465, 50609, 87295, 90455, 235183, 253045, 307547, 1175915, 1537735, 3998111, 19990555]

約数ペア:

[(1, 19990555), (5, 3998111), (13, 1537735), (17, 1175915), (65, 307547), (79, 253045), (85, 235183), (221, 90455), (229, 87295), (395, 50609), (1027, 19465), (1105, 18091), (1145, 17459), (1343, 14885), (2977, 6715), (3893, 5135)]