20210025

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^2\times {\mathrm{17}}^1\times {\mathrm{131}}^1$

素因数の和:183

約数の個数: 72

約数和(自身を含む): 39184992

約数和(自身を除く): 18974967

約数列:

[1, 3, 5, 11, 15, 17, 25, 33, 51, 55, 75, 85, 121, 131, 165, 187, 255, 275, 363, 393, 425, 561, 605, 655, 825, 935, 1275, 1441, 1815, 1965, 2057, 2227, 2805, 3025, 3275, 4323, 4675, 6171, 6681, 7205, 9075, 9825, 10285, 11135, 14025, 15851, 21615, 24497, 30855, 33405, 36025, 47553, 51425, 55675, 73491, 79255, 108075, 122485, 154275, 167025, 237765, 269467, 367455, 396275, 612425, 808401, 1188825, 1347335, 1837275, 4042005, 6736675, 20210025]

約数ペア:

[(1, 20210025), (3, 6736675), (5, 4042005), (11, 1837275), (15, 1347335), (17, 1188825), (25, 808401), (33, 612425), (51, 396275), (55, 367455), (75, 269467), (85, 237765), (121, 167025), (131, 154275), (165, 122485), (187, 108075), (255, 79255), (275, 73491), (363, 55675), (393, 51425), (425, 47553), (561, 36025), (605, 33405), (655, 30855), (825, 24497), (935, 21615), (1275, 15851), (1441, 14025), (1815, 11135), (1965, 10285), (2057, 9825), (2227, 9075), (2805, 7205), (3025, 6681), (3275, 6171), (4323, 4675)]