20989540

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{179}}^1$

素因数の和:253

約数の個数: 96

約数和(自身を含む): 53343360

約数和(自身を除く): 32353820

約数列:

[1, 2, 4, 5, 10, 11, 13, 20, 22, 26, 41, 44, 52, 55, 65, 82, 110, 130, 143, 164, 179, 205, 220, 260, 286, 358, 410, 451, 533, 572, 715, 716, 820, 895, 902, 1066, 1430, 1790, 1804, 1969, 2132, 2255, 2327, 2665, 2860, 3580, 3938, 4510, 4654, 5330, 5863, 7339, 7876, 9020, 9308, 9845, 10660, 11635, 11726, 14678, 19690, 23270, 23452, 25597, 29315, 29356, 36695, 39380, 46540, 51194, 58630, 73390, 80729, 95407, 102388, 117260, 127985, 146780, 161458, 190814, 255970, 322916, 381628, 403645, 477035, 511940, 807290, 954070, 1049477, 1614580, 1908140, 2098954, 4197908, 5247385, 10494770, 20989540]

約数ペア:

[(1, 20989540), (2, 10494770), (4, 5247385), (5, 4197908), (10, 2098954), (11, 1908140), (13, 1614580), (20, 1049477), (22, 954070), (26, 807290), (41, 511940), (44, 477035), (52, 403645), (55, 381628), (65, 322916), (82, 255970), (110, 190814), (130, 161458), (143, 146780), (164, 127985), (179, 117260), (205, 102388), (220, 95407), (260, 80729), (286, 73390), (358, 58630), (410, 51194), (451, 46540), (533, 39380), (572, 36695), (715, 29356), (716, 29315), (820, 25597), (895, 23452), (902, 23270), (1066, 19690), (1430, 14678), (1790, 11726), (1804, 11635), (1969, 10660), (2132, 9845), (2255, 9308), (2327, 9020), (2665, 7876), (2860, 7339), (3580, 5863), (3938, 5330), (4510, 4654)]