21120525

素因数分解:

$3^2\times 5^2\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{59}}^1$

素因数の和:155

約数の個数: 72

約数和(自身を含む): 40428960

約数和(自身を除く): 19308435

約数列:

[1, 3, 5, 9, 15, 25, 37, 43, 45, 59, 75, 111, 129, 177, 185, 215, 225, 295, 333, 387, 531, 555, 645, 885, 925, 1075, 1475, 1591, 1665, 1935, 2183, 2537, 2655, 2775, 3225, 4425, 4773, 6549, 7611, 7955, 8325, 9675, 10915, 12685, 13275, 14319, 19647, 22833, 23865, 32745, 38055, 39775, 54575, 63425, 71595, 93869, 98235, 114165, 119325, 163725, 190275, 281607, 357975, 469345, 491175, 570825, 844821, 1408035, 2346725, 4224105, 7040175, 21120525]

約数ペア:

[(1, 21120525), (3, 7040175), (5, 4224105), (9, 2346725), (15, 1408035), (25, 844821), (37, 570825), (43, 491175), (45, 469345), (59, 357975), (75, 281607), (111, 190275), (129, 163725), (177, 119325), (185, 114165), (215, 98235), (225, 93869), (295, 71595), (333, 63425), (387, 54575), (531, 39775), (555, 38055), (645, 32745), (885, 23865), (925, 22833), (1075, 19647), (1475, 14319), (1591, 13275), (1665, 12685), (1935, 10915), (2183, 9675), (2537, 8325), (2655, 7955), (2775, 7611), (3225, 6549), (4425, 4773)]