19991440

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{1231}}^1$

素因数の和:1280

約数の個数: 80

約数和(自身を含む): 54996480

約数和(自身を除く): 35005040

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 29, 35, 40, 56, 58, 70, 80, 112, 116, 140, 145, 203, 232, 280, 290, 406, 464, 560, 580, 812, 1015, 1160, 1231, 1624, 2030, 2320, 2462, 3248, 4060, 4924, 6155, 8120, 8617, 9848, 12310, 16240, 17234, 19696, 24620, 34468, 35699, 43085, 49240, 68936, 71398, 86170, 98480, 137872, 142796, 172340, 178495, 249893, 285592, 344680, 356990, 499786, 571184, 689360, 713980, 999572, 1249465, 1427960, 1999144, 2498930, 2855920, 3998288, 4997860, 9995720, 19991440]

約数ペア:

[(1, 19991440), (2, 9995720), (4, 4997860), (5, 3998288), (7, 2855920), (8, 2498930), (10, 1999144), (14, 1427960), (16, 1249465), (20, 999572), (28, 713980), (29, 689360), (35, 571184), (40, 499786), (56, 356990), (58, 344680), (70, 285592), (80, 249893), (112, 178495), (116, 172340), (140, 142796), (145, 137872), (203, 98480), (232, 86170), (280, 71398), (290, 68936), (406, 49240), (464, 43085), (560, 35699), (580, 34468), (812, 24620), (1015, 19696), (1160, 17234), (1231, 16240), (1624, 12310), (2030, 9848), (2320, 8617), (2462, 8120), (3248, 6155), (4060, 4924)]