21161220

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{31}}^2\times {\mathrm{367}}^1$

素因数の和:441

約数の個数: 72

約数和(自身を含む): 61391232

約数和(自身を除く): 40230012

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 31, 60, 62, 93, 124, 155, 186, 310, 367, 372, 465, 620, 734, 930, 961, 1101, 1468, 1835, 1860, 1922, 2202, 2883, 3670, 3844, 4404, 4805, 5505, 5766, 7340, 9610, 11010, 11377, 11532, 14415, 19220, 22020, 22754, 28830, 34131, 45508, 56885, 57660, 68262, 113770, 136524, 170655, 227540, 341310, 352687, 682620, 705374, 1058061, 1410748, 1763435, 2116122, 3526870, 4232244, 5290305, 7053740, 10580610, 21161220]

約数ペア:

[(1, 21161220), (2, 10580610), (3, 7053740), (4, 5290305), (5, 4232244), (6, 3526870), (10, 2116122), (12, 1763435), (15, 1410748), (20, 1058061), (30, 705374), (31, 682620), (60, 352687), (62, 341310), (93, 227540), (124, 170655), (155, 136524), (186, 113770), (310, 68262), (367, 57660), (372, 56885), (465, 45508), (620, 34131), (734, 28830), (930, 22754), (961, 22020), (1101, 19220), (1468, 14415), (1835, 11532), (1860, 11377), (1922, 11010), (2202, 9610), (2883, 7340), (3670, 5766), (3844, 5505), (4404, 4805)]