20878910

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{107}}^1$

素因数の和:225

約数の個数: 64

約数和(自身を含む): 43545600

約数和(自身を除く): 22666690

約数列:

[1, 2, 5, 10, 13, 19, 26, 38, 65, 79, 95, 107, 130, 158, 190, 214, 247, 395, 494, 535, 790, 1027, 1070, 1235, 1391, 1501, 2033, 2054, 2470, 2782, 3002, 4066, 5135, 6955, 7505, 8453, 10165, 10270, 13910, 15010, 16906, 19513, 20330, 26429, 39026, 42265, 52858, 84530, 97565, 109889, 132145, 160607, 195130, 219778, 264290, 321214, 549445, 803035, 1098890, 1606070, 2087891, 4175782, 10439455, 20878910]

約数ペア:

[(1, 20878910), (2, 10439455), (5, 4175782), (10, 2087891), (13, 1606070), (19, 1098890), (26, 803035), (38, 549445), (65, 321214), (79, 264290), (95, 219778), (107, 195130), (130, 160607), (158, 132145), (190, 109889), (214, 97565), (247, 84530), (395, 52858), (494, 42265), (535, 39026), (790, 26429), (1027, 20330), (1070, 19513), (1235, 16906), (1391, 15010), (1501, 13910), (2033, 10270), (2054, 10165), (2470, 8453), (2782, 7505), (3002, 6955), (4066, 5135)]