21768925

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{23}}^1\times {\mathrm{131}}^1$

素因数の和:198

約数の個数: 36

約数和(自身を含む): 30149856

約数和(自身を除く): 8380931

約数列:

[1, 5, 17, 23, 25, 85, 115, 131, 289, 391, 425, 575, 655, 1445, 1955, 2227, 3013, 3275, 6647, 7225, 9775, 11135, 15065, 33235, 37859, 51221, 55675, 75325, 166175, 189295, 256105, 870757, 946475, 1280525, 4353785, 21768925]

約数ペア:

[(1, 21768925), (5, 4353785), (17, 1280525), (23, 946475), (25, 870757), (85, 256105), (115, 189295), (131, 166175), (289, 75325), (391, 55675), (425, 51221), (575, 37859), (655, 33235), (1445, 15065), (1955, 11135), (2227, 9775), (3013, 7225), (3275, 6647)]