639487840

素因数分解:

$2^5\times 5^1\times {\mathrm{31}}^2\times {\mathrm{4159}}^1$

素因数の和:4236

約数の個数: 72

約数和(自身を含む): 1561472640

約数和(自身を除く): 921984800

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 80, 124, 155, 160, 248, 310, 496, 620, 961, 992, 1240, 1922, 2480, 3844, 4159, 4805, 4960, 7688, 8318, 9610, 15376, 16636, 19220, 20795, 30752, 33272, 38440, 41590, 66544, 76880, 83180, 128929, 133088, 153760, 166360, 257858, 332720, 515716, 644645, 665440, 1031432, 1289290, 2062864, 2578580, 3996799, 4125728, 5157160, 7993598, 10314320, 15987196, 19983995, 20628640, 31974392, 39967990, 63948784, 79935980, 127897568, 159871960, 319743920, 639487840]

約数ペア:

[(1, 639487840), (2, 319743920), (4, 159871960), (5, 127897568), (8, 79935980), (10, 63948784), (16, 39967990), (20, 31974392), (31, 20628640), (32, 19983995), (40, 15987196), (62, 10314320), (80, 7993598), (124, 5157160), (155, 4125728), (160, 3996799), (248, 2578580), (310, 2062864), (496, 1289290), (620, 1031432), (961, 665440), (992, 644645), (1240, 515716), (1922, 332720), (2480, 257858), (3844, 166360), (4159, 153760), (4805, 133088), (4960, 128929), (7688, 83180), (8318, 76880), (9610, 66544), (15376, 41590), (16636, 38440), (19220, 33272), (20795, 30752)]