21104225

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{127}}^1$

素因数の和:194

約数の個数: 36

約数和(自身を含む): 29236224

約数和(自身を除く): 8131999

約数列:

[1, 5, 17, 23, 25, 85, 115, 127, 289, 391, 425, 575, 635, 1445, 1955, 2159, 2921, 3175, 6647, 7225, 9775, 10795, 14605, 33235, 36703, 49657, 53975, 73025, 166175, 183515, 248285, 844169, 917575, 1241425, 4220845, 21104225]

約数ペア:

[(1, 21104225), (5, 4220845), (17, 1241425), (23, 917575), (25, 844169), (85, 248285), (115, 183515), (127, 166175), (289, 73025), (391, 53975), (425, 49657), (575, 36703), (635, 33235), (1445, 14605), (1955, 10795), (2159, 9775), (2921, 7225), (3175, 6647)]