21810490

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:247

約数の個数: 64

約数和(自身を含む): 45722880

約数和(自身を除く): 23912390

約数列:

[1, 2, 5, 10, 13, 17, 26, 34, 65, 71, 85, 130, 139, 142, 170, 221, 278, 355, 442, 695, 710, 923, 1105, 1207, 1390, 1807, 1846, 2210, 2363, 2414, 3614, 4615, 4726, 6035, 9035, 9230, 9869, 11815, 12070, 15691, 18070, 19738, 23630, 30719, 31382, 49345, 61438, 78455, 98690, 128297, 153595, 156910, 167773, 256594, 307190, 335546, 641485, 838865, 1282970, 1677730, 2181049, 4362098, 10905245, 21810490]

約数ペア:

[(1, 21810490), (2, 10905245), (5, 4362098), (10, 2181049), (13, 1677730), (17, 1282970), (26, 838865), (34, 641485), (65, 335546), (71, 307190), (85, 256594), (130, 167773), (139, 156910), (142, 153595), (170, 128297), (221, 98690), (278, 78455), (355, 61438), (442, 49345), (695, 31382), (710, 30719), (923, 23630), (1105, 19738), (1207, 18070), (1390, 15691), (1807, 12070), (1846, 11815), (2210, 9869), (2363, 9230), (2414, 9035), (3614, 6035), (4615, 4726)]