21257820

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{6947}}^1$

素因数の和:6979

約数の個数: 72

約数和(自身を含む): 68284944

約数和(自身を除く): 47027124

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 17, 18, 20, 30, 34, 36, 45, 51, 60, 68, 85, 90, 102, 153, 170, 180, 204, 255, 306, 340, 510, 612, 765, 1020, 1530, 3060, 6947, 13894, 20841, 27788, 34735, 41682, 62523, 69470, 83364, 104205, 118099, 125046, 138940, 208410, 236198, 250092, 312615, 354297, 416820, 472396, 590495, 625230, 708594, 1062891, 1180990, 1250460, 1417188, 1771485, 2125782, 2361980, 3542970, 4251564, 5314455, 7085940, 10628910, 21257820]

約数ペア:

[(1, 21257820), (2, 10628910), (3, 7085940), (4, 5314455), (5, 4251564), (6, 3542970), (9, 2361980), (10, 2125782), (12, 1771485), (15, 1417188), (17, 1250460), (18, 1180990), (20, 1062891), (30, 708594), (34, 625230), (36, 590495), (45, 472396), (51, 416820), (60, 354297), (68, 312615), (85, 250092), (90, 236198), (102, 208410), (153, 138940), (170, 125046), (180, 118099), (204, 104205), (255, 83364), (306, 69470), (340, 62523), (510, 41682), (612, 34735), (765, 27788), (1020, 20841), (1530, 13894), (3060, 6947)]