21951020

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{1723}}^1$

素因数の和:1759

約数の個数: 72

約数和(自身を含む): 57781584

約数和(自身を除く): 35830564

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 49, 52, 65, 70, 91, 98, 130, 140, 182, 196, 245, 260, 364, 455, 490, 637, 910, 980, 1274, 1723, 1820, 2548, 3185, 3446, 6370, 6892, 8615, 12061, 12740, 17230, 22399, 24122, 34460, 44798, 48244, 60305, 84427, 89596, 111995, 120610, 156793, 168854, 223990, 241220, 313586, 337708, 422135, 447980, 627172, 783965, 844270, 1097551, 1567930, 1688540, 2195102, 3135860, 4390204, 5487755, 10975510, 21951020]

約数ペア:

[(1, 21951020), (2, 10975510), (4, 5487755), (5, 4390204), (7, 3135860), (10, 2195102), (13, 1688540), (14, 1567930), (20, 1097551), (26, 844270), (28, 783965), (35, 627172), (49, 447980), (52, 422135), (65, 337708), (70, 313586), (91, 241220), (98, 223990), (130, 168854), (140, 156793), (182, 120610), (196, 111995), (245, 89596), (260, 84427), (364, 60305), (455, 48244), (490, 44798), (637, 34460), (910, 24122), (980, 22399), (1274, 17230), (1723, 12740), (1820, 12061), (2548, 8615), (3185, 6892), (3446, 6370)]