199999980

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{239}}^1\times {\mathrm{4649}}^1$

素因数の和:4903

約数の個数: 72

約数和(自身を含む): 609336000

約数和(自身を除く): 409336020

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180, 239, 478, 717, 956, 1195, 1434, 2151, 2390, 2868, 3585, 4302, 4649, 4780, 7170, 8604, 9298, 10755, 13947, 14340, 18596, 21510, 23245, 27894, 41841, 43020, 46490, 55788, 69735, 83682, 92980, 139470, 167364, 209205, 278940, 418410, 836820, 1111111, 2222222, 3333333, 4444444, 5555555, 6666666, 9999999, 11111110, 13333332, 16666665, 19999998, 22222220, 33333330, 39999996, 49999995, 66666660, 99999990, 199999980]

約数ペア:

[(1, 199999980), (2, 99999990), (3, 66666660), (4, 49999995), (5, 39999996), (6, 33333330), (9, 22222220), (10, 19999998), (12, 16666665), (15, 13333332), (18, 11111110), (20, 9999999), (30, 6666666), (36, 5555555), (45, 4444444), (60, 3333333), (90, 2222222), (180, 1111111), (239, 836820), (478, 418410), (717, 278940), (956, 209205), (1195, 167364), (1434, 139470), (2151, 92980), (2390, 83682), (2868, 69735), (3585, 55788), (4302, 46490), (4649, 43020), (4780, 41841), (7170, 27894), (8604, 23245), (9298, 21510), (10755, 18596), (13947, 14340)]