639335920

素因数分解:

$2^4\times 5^1\times {\mathrm{113}}^1\times {\mathrm{197}}^1\times {\mathrm{359}}^1$

素因数の和:682

約数の個数: 80

約数和(自身を含む): 1511421120

約数和(自身を除く): 872085200

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 113, 197, 226, 359, 394, 452, 565, 718, 788, 904, 985, 1130, 1436, 1576, 1795, 1808, 1970, 2260, 2872, 3152, 3590, 3940, 4520, 5744, 7180, 7880, 9040, 14360, 15760, 22261, 28720, 40567, 44522, 70723, 81134, 89044, 111305, 141446, 162268, 178088, 202835, 222610, 282892, 324536, 353615, 356176, 405670, 445220, 565784, 649072, 707230, 811340, 890440, 1131568, 1414460, 1622680, 1780880, 2828920, 3245360, 5657840, 7991699, 15983398, 31966796, 39958495, 63933592, 79916990, 127867184, 159833980, 319667960, 639335920]

約数ペア:

[(1, 639335920), (2, 319667960), (4, 159833980), (5, 127867184), (8, 79916990), (10, 63933592), (16, 39958495), (20, 31966796), (40, 15983398), (80, 7991699), (113, 5657840), (197, 3245360), (226, 2828920), (359, 1780880), (394, 1622680), (452, 1414460), (565, 1131568), (718, 890440), (788, 811340), (904, 707230), (985, 649072), (1130, 565784), (1436, 445220), (1576, 405670), (1795, 356176), (1808, 353615), (1970, 324536), (2260, 282892), (2872, 222610), (3152, 202835), (3590, 178088), (3940, 162268), (4520, 141446), (5744, 111305), (7180, 89044), (7880, 81134), (9040, 70723), (14360, 44522), (15760, 40567), (22261, 28720)]