21240140

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{179}}^1\times {\mathrm{349}}^1$

素因数の和:554

約数の個数: 48

約数和(自身を含む): 47628000

約数和(自身を除く): 26387860

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 179, 340, 349, 358, 698, 716, 895, 1396, 1745, 1790, 3043, 3490, 3580, 5933, 6086, 6980, 11866, 12172, 15215, 23732, 29665, 30430, 59330, 60860, 62471, 118660, 124942, 249884, 312355, 624710, 1062007, 1249420, 2124014, 4248028, 5310035, 10620070, 21240140]

約数ペア:

[(1, 21240140), (2, 10620070), (4, 5310035), (5, 4248028), (10, 2124014), (17, 1249420), (20, 1062007), (34, 624710), (68, 312355), (85, 249884), (170, 124942), (179, 118660), (340, 62471), (349, 60860), (358, 59330), (698, 30430), (716, 29665), (895, 23732), (1396, 15215), (1745, 12172), (1790, 11866), (3043, 6980), (3490, 6086), (3580, 5933)]