19991125

素因数分解:

$5^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{67}}^1$

素因数の和:131

約数の個数: 64

約数和(自身を含む): 32587776

約数和(自身を除く): 12596651

約数列:

[1, 5, 7, 11, 25, 31, 35, 55, 67, 77, 125, 155, 175, 217, 275, 335, 341, 385, 469, 737, 775, 875, 1085, 1375, 1675, 1705, 1925, 2077, 2345, 2387, 3685, 3875, 5159, 5425, 8375, 8525, 9625, 10385, 11725, 11935, 14539, 18425, 22847, 25795, 27125, 42625, 51925, 58625, 59675, 72695, 92125, 114235, 128975, 159929, 259625, 298375, 363475, 571175, 644875, 799645, 1817375, 2855875, 3998225, 19991125]

約数ペア:

[(1, 19991125), (5, 3998225), (7, 2855875), (11, 1817375), (25, 799645), (31, 644875), (35, 571175), (55, 363475), (67, 298375), (77, 259625), (125, 159929), (155, 128975), (175, 114235), (217, 92125), (275, 72695), (335, 59675), (341, 58625), (385, 51925), (469, 42625), (737, 27125), (775, 25795), (875, 22847), (1085, 18425), (1375, 14539), (1675, 11935), (1705, 11725), (1925, 10385), (2077, 9625), (2345, 8525), (2387, 8375), (3685, 5425), (3875, 5159)]