20808580

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{491}}^1$

素因数の和:676

約数の個数: 48

約数和(自身を含む): 47444544

約数和(自身を除く): 26635964

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 163, 260, 326, 491, 652, 815, 982, 1630, 1964, 2119, 2455, 3260, 4238, 4910, 6383, 8476, 9820, 10595, 12766, 21190, 25532, 31915, 42380, 63830, 80033, 127660, 160066, 320132, 400165, 800330, 1040429, 1600660, 2080858, 4161716, 5202145, 10404290, 20808580]

約数ペア:

[(1, 20808580), (2, 10404290), (4, 5202145), (5, 4161716), (10, 2080858), (13, 1600660), (20, 1040429), (26, 800330), (52, 400165), (65, 320132), (130, 160066), (163, 127660), (260, 80033), (326, 63830), (491, 42380), (652, 31915), (815, 25532), (982, 21190), (1630, 12766), (1964, 10595), (2119, 9820), (2455, 8476), (3260, 6383), (4238, 4910)]