19981000

素因数分解:

$2^3\times 5^3\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{53}}^1$

素因数の和:116

約数の個数: 128

約数和(自身を含む): 53071200

約数和(自身を除く): 33090200

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 25, 26, 29, 40, 50, 52, 53, 58, 65, 100, 104, 106, 116, 125, 130, 145, 200, 212, 232, 250, 260, 265, 290, 325, 377, 424, 500, 520, 530, 580, 650, 689, 725, 754, 1000, 1060, 1160, 1300, 1325, 1378, 1450, 1508, 1537, 1625, 1885, 2120, 2600, 2650, 2756, 2900, 3016, 3074, 3250, 3445, 3625, 3770, 5300, 5512, 5800, 6148, 6500, 6625, 6890, 7250, 7540, 7685, 9425, 10600, 12296, 13000, 13250, 13780, 14500, 15080, 15370, 17225, 18850, 19981, 26500, 27560, 29000, 30740, 34450, 37700, 38425, 39962, 47125, 53000, 61480, 68900, 75400, 76850, 79924, 86125, 94250, 99905, 137800, 153700, 159848, 172250, 188500, 192125, 199810, 307400, 344500, 377000, 384250, 399620, 499525, 689000, 768500, 799240, 999050, 1537000, 1998100, 2497625, 3996200, 4995250, 9990500, 19981000]

約数ペア:

[(1, 19981000), (2, 9990500), (4, 4995250), (5, 3996200), (8, 2497625), (10, 1998100), (13, 1537000), (20, 999050), (25, 799240), (26, 768500), (29, 689000), (40, 499525), (50, 399620), (52, 384250), (53, 377000), (58, 344500), (65, 307400), (100, 199810), (104, 192125), (106, 188500), (116, 172250), (125, 159848), (130, 153700), (145, 137800), (200, 99905), (212, 94250), (232, 86125), (250, 79924), (260, 76850), (265, 75400), (290, 68900), (325, 61480), (377, 53000), (424, 47125), (500, 39962), (520, 38425), (530, 37700), (580, 34450), (650, 30740), (689, 29000), (725, 27560), (754, 26500), (1000, 19981), (1060, 18850), (1160, 17225), (1300, 15370), (1325, 15080), (1378, 14500), (1450, 13780), (1508, 13250), (1537, 13000), (1625, 12296), (1885, 10600), (2120, 9425), (2600, 7685), (2650, 7540), (2756, 7250), (2900, 6890), (3016, 6625), (3074, 6500), (3250, 6148), (3445, 5800), (3625, 5512), (3770, 5300)]