21638890

素因数分解:

$2^1\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{79}}^1$

素因数の和:156

約数の個数: 96

約数和(自身を含む): 50561280

約数和(自身を除く): 28922390

約数列:

[1, 2, 5, 7, 10, 13, 14, 26, 35, 43, 49, 65, 70, 79, 86, 91, 98, 130, 158, 182, 215, 245, 301, 395, 430, 455, 490, 553, 559, 602, 637, 790, 910, 1027, 1106, 1118, 1274, 1505, 2054, 2107, 2765, 2795, 3010, 3185, 3397, 3871, 3913, 4214, 5135, 5530, 5590, 6370, 6794, 7189, 7742, 7826, 10270, 10535, 14378, 16985, 19355, 19565, 21070, 23779, 27391, 33970, 35945, 38710, 39130, 44161, 47558, 50323, 54782, 71890, 88322, 100646, 118895, 136955, 166453, 220805, 237790, 251615, 273910, 309127, 332906, 441610, 503230, 618254, 832265, 1545635, 1664530, 2163889, 3091270, 4327778, 10819445, 21638890]

約数ペア:

[(1, 21638890), (2, 10819445), (5, 4327778), (7, 3091270), (10, 2163889), (13, 1664530), (14, 1545635), (26, 832265), (35, 618254), (43, 503230), (49, 441610), (65, 332906), (70, 309127), (79, 273910), (86, 251615), (91, 237790), (98, 220805), (130, 166453), (158, 136955), (182, 118895), (215, 100646), (245, 88322), (301, 71890), (395, 54782), (430, 50323), (455, 47558), (490, 44161), (553, 39130), (559, 38710), (602, 35945), (637, 33970), (790, 27391), (910, 23779), (1027, 21070), (1106, 19565), (1118, 19355), (1274, 16985), (1505, 14378), (2054, 10535), (2107, 10270), (2765, 7826), (2795, 7742), (3010, 7189), (3185, 6794), (3397, 6370), (3871, 5590), (3913, 5530), (4214, 5135)]