28000980

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{313}}^1$

素因数の和:406

約数の個数: 144

約数和(自身を含む): 98751744

約数和(自身を除く): 70750764

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 71, 84, 90, 105, 126, 140, 142, 180, 210, 213, 252, 284, 313, 315, 355, 420, 426, 497, 626, 630, 639, 710, 852, 939, 994, 1065, 1252, 1260, 1278, 1420, 1491, 1565, 1878, 1988, 2130, 2191, 2485, 2556, 2817, 2982, 3130, 3195, 3756, 4260, 4382, 4473, 4695, 4970, 5634, 5964, 6260, 6390, 6573, 7455, 8764, 8946, 9390, 9940, 10955, 11268, 12780, 13146, 14085, 14910, 17892, 18780, 19719, 21910, 22223, 22365, 26292, 28170, 29820, 32865, 39438, 43820, 44446, 44730, 56340, 65730, 66669, 78876, 88892, 89460, 98595, 111115, 131460, 133338, 155561, 197190, 200007, 222230, 266676, 311122, 333345, 394380, 400014, 444460, 466683, 622244, 666690, 777805, 800028, 933366, 1000035, 1333380, 1400049, 1555610, 1866732, 2000070, 2333415, 2800098, 3111220, 4000140, 4666830, 5600196, 7000245, 9333660, 14000490, 28000980]

約数ペア:

[(1, 28000980), (2, 14000490), (3, 9333660), (4, 7000245), (5, 5600196), (6, 4666830), (7, 4000140), (9, 3111220), (10, 2800098), (12, 2333415), (14, 2000070), (15, 1866732), (18, 1555610), (20, 1400049), (21, 1333380), (28, 1000035), (30, 933366), (35, 800028), (36, 777805), (42, 666690), (45, 622244), (60, 466683), (63, 444460), (70, 400014), (71, 394380), (84, 333345), (90, 311122), (105, 266676), (126, 222230), (140, 200007), (142, 197190), (180, 155561), (210, 133338), (213, 131460), (252, 111115), (284, 98595), (313, 89460), (315, 88892), (355, 78876), (420, 66669), (426, 65730), (497, 56340), (626, 44730), (630, 44446), (639, 43820), (710, 39438), (852, 32865), (939, 29820), (994, 28170), (1065, 26292), (1252, 22365), (1260, 22223), (1278, 21910), (1420, 19719), (1491, 18780), (1565, 17892), (1878, 14910), (1988, 14085), (2130, 13146), (2191, 12780), (2485, 11268), (2556, 10955), (2817, 9940), (2982, 9390), (3130, 8946), (3195, 8764), (3756, 7455), (4260, 6573), (4382, 6390), (4473, 6260), (4695, 5964), (4970, 5634)]