21217761

素因数分解:

$3^3\times {\mathrm{37}}^1\times {\mathrm{67}}^1\times {\mathrm{317}}^1$

素因数の和:430

約数の個数: 32

約数和(自身を含む): 32868480

約数和(自身を除く): 11650719

約数列:

[1, 3, 9, 27, 37, 67, 111, 201, 317, 333, 603, 951, 999, 1809, 2479, 2853, 7437, 8559, 11729, 21239, 22311, 35187, 63717, 66933, 105561, 191151, 316683, 573453, 785843, 2357529, 7072587, 21217761]

約数ペア:

[(1, 21217761), (3, 7072587), (9, 2357529), (27, 785843), (37, 573453), (67, 316683), (111, 191151), (201, 105561), (317, 66933), (333, 63717), (603, 35187), (951, 22311), (999, 21239), (1809, 11729), (2479, 8559), (2853, 7437)]