20871240

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{787}}^1$

素因数の和:831

約数の個数: 128

約数和(自身を含む): 71487360

約数和(自身を除く): 50616120

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 17, 20, 24, 26, 30, 34, 39, 40, 51, 52, 60, 65, 68, 78, 85, 102, 104, 120, 130, 136, 156, 170, 195, 204, 221, 255, 260, 312, 340, 390, 408, 442, 510, 520, 663, 680, 780, 787, 884, 1020, 1105, 1326, 1560, 1574, 1768, 2040, 2210, 2361, 2652, 3148, 3315, 3935, 4420, 4722, 5304, 6296, 6630, 7870, 8840, 9444, 10231, 11805, 13260, 13379, 15740, 18888, 20462, 23610, 26520, 26758, 30693, 31480, 40137, 40924, 47220, 51155, 53516, 61386, 66895, 80274, 81848, 94440, 102310, 107032, 122772, 133790, 153465, 160548, 173927, 200685, 204620, 245544, 267580, 306930, 321096, 347854, 401370, 409240, 521781, 535160, 613860, 695708, 802740, 869635, 1043562, 1227720, 1391416, 1605480, 1739270, 2087124, 2608905, 3478540, 4174248, 5217810, 6957080, 10435620, 20871240]

約数ペア:

[(1, 20871240), (2, 10435620), (3, 6957080), (4, 5217810), (5, 4174248), (6, 3478540), (8, 2608905), (10, 2087124), (12, 1739270), (13, 1605480), (15, 1391416), (17, 1227720), (20, 1043562), (24, 869635), (26, 802740), (30, 695708), (34, 613860), (39, 535160), (40, 521781), (51, 409240), (52, 401370), (60, 347854), (65, 321096), (68, 306930), (78, 267580), (85, 245544), (102, 204620), (104, 200685), (120, 173927), (130, 160548), (136, 153465), (156, 133790), (170, 122772), (195, 107032), (204, 102310), (221, 94440), (255, 81848), (260, 80274), (312, 66895), (340, 61386), (390, 53516), (408, 51155), (442, 47220), (510, 40924), (520, 40137), (663, 31480), (680, 30693), (780, 26758), (787, 26520), (884, 23610), (1020, 20462), (1105, 18888), (1326, 15740), (1560, 13379), (1574, 13260), (1768, 11805), (2040, 10231), (2210, 9444), (2361, 8840), (2652, 7870), (3148, 6630), (3315, 6296), (3935, 5304), (4420, 4722)]