646637680

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^2\times {\mathrm{647}}^1$

素因数の和:735

約数の個数: 120

約数和(自身を含む): 1675580256

約数和(自身を除く): 1028942576

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 31, 40, 52, 62, 65, 80, 104, 124, 130, 155, 208, 248, 260, 310, 403, 496, 520, 620, 647, 806, 961, 1040, 1240, 1294, 1612, 1922, 2015, 2480, 2588, 3224, 3235, 3844, 4030, 4805, 5176, 6448, 6470, 7688, 8060, 8411, 9610, 10352, 12493, 12940, 15376, 16120, 16822, 19220, 20057, 24986, 25880, 32240, 33644, 38440, 40114, 42055, 49972, 51760, 62465, 67288, 76880, 80228, 84110, 99944, 100285, 124930, 134576, 160456, 168220, 199888, 200570, 249860, 260741, 320912, 336440, 401140, 499720, 521482, 621767, 672880, 802280, 999440, 1042964, 1243534, 1303705, 1604560, 2085928, 2487068, 2607410, 3108835, 4171856, 4974136, 5214820, 6217670, 8082971, 9948272, 10429640, 12435340, 16165942, 20859280, 24870680, 32331884, 40414855, 49741360, 64663768, 80829710, 129327536, 161659420, 323318840, 646637680]

約数ペア:

[(1, 646637680), (2, 323318840), (4, 161659420), (5, 129327536), (8, 80829710), (10, 64663768), (13, 49741360), (16, 40414855), (20, 32331884), (26, 24870680), (31, 20859280), (40, 16165942), (52, 12435340), (62, 10429640), (65, 9948272), (80, 8082971), (104, 6217670), (124, 5214820), (130, 4974136), (155, 4171856), (208, 3108835), (248, 2607410), (260, 2487068), (310, 2085928), (403, 1604560), (496, 1303705), (520, 1243534), (620, 1042964), (647, 999440), (806, 802280), (961, 672880), (1040, 621767), (1240, 521482), (1294, 499720), (1612, 401140), (1922, 336440), (2015, 320912), (2480, 260741), (2588, 249860), (3224, 200570), (3235, 199888), (3844, 168220), (4030, 160456), (4805, 134576), (5176, 124930), (6448, 100285), (6470, 99944), (7688, 84110), (8060, 80228), (8411, 76880), (9610, 67288), (10352, 62465), (12493, 51760), (12940, 49972), (15376, 42055), (16120, 40114), (16822, 38440), (19220, 33644), (20057, 32240), (24986, 25880)]