21538660

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{443}}^1$

素因数の和:493

約数の個数: 96

約数和(自身を含む): 56391552

約数和(自身を除く): 34852892

約数列:

[1, 2, 4, 5, 10, 11, 13, 17, 20, 22, 26, 34, 44, 52, 55, 65, 68, 85, 110, 130, 143, 170, 187, 220, 221, 260, 286, 340, 374, 442, 443, 572, 715, 748, 884, 886, 935, 1105, 1430, 1772, 1870, 2210, 2215, 2431, 2860, 3740, 4420, 4430, 4862, 4873, 5759, 7531, 8860, 9724, 9746, 11518, 12155, 15062, 19492, 23036, 24310, 24365, 28795, 30124, 37655, 48620, 48730, 57590, 63349, 75310, 82841, 97460, 97903, 115180, 126698, 150620, 165682, 195806, 253396, 316745, 331364, 391612, 414205, 489515, 633490, 828410, 979030, 1076933, 1266980, 1656820, 1958060, 2153866, 4307732, 5384665, 10769330, 21538660]

約数ペア:

[(1, 21538660), (2, 10769330), (4, 5384665), (5, 4307732), (10, 2153866), (11, 1958060), (13, 1656820), (17, 1266980), (20, 1076933), (22, 979030), (26, 828410), (34, 633490), (44, 489515), (52, 414205), (55, 391612), (65, 331364), (68, 316745), (85, 253396), (110, 195806), (130, 165682), (143, 150620), (170, 126698), (187, 115180), (220, 97903), (221, 97460), (260, 82841), (286, 75310), (340, 63349), (374, 57590), (442, 48730), (443, 48620), (572, 37655), (715, 30124), (748, 28795), (884, 24365), (886, 24310), (935, 23036), (1105, 19492), (1430, 15062), (1772, 12155), (1870, 11518), (2210, 9746), (2215, 9724), (2431, 8860), (2860, 7531), (3740, 5759), (4420, 4873), (4430, 4862)]