81278275

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{313}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 117742464

約数和(自身を除く): 36464189

約数列:

[1, 5, 13, 17, 25, 47, 65, 85, 221, 235, 313, 325, 425, 611, 799, 1105, 1175, 1565, 3055, 3995, 4069, 5321, 5525, 7825, 10387, 14711, 15275, 19975, 20345, 26605, 51935, 69173, 73555, 101725, 133025, 191243, 250087, 259675, 345865, 367775, 956215, 1250435, 1729325, 3251131, 4781075, 6252175, 16255655, 81278275]

約数ペア:

[(1, 81278275), (5, 16255655), (13, 6252175), (17, 4781075), (25, 3251131), (47, 1729325), (65, 1250435), (85, 956215), (221, 367775), (235, 345865), (313, 259675), (325, 250087), (425, 191243), (611, 133025), (799, 101725), (1105, 73555), (1175, 69173), (1565, 51935), (3055, 26605), (3995, 20345), (4069, 19975), (5321, 15275), (5525, 14711), (7825, 10387)]