21256920

素因数分解:

$2^3\times 3^2\times 5^1\times {\mathrm{137}}^1\times {\mathrm{431}}^1$

素因数の和:585

約数の個数: 96

約数和(自身を含む): 69750720

約数和(自身を除く): 48493800

約数列:

[1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20, 24, 30, 36, 40, 45, 60, 72, 90, 120, 137, 180, 274, 360, 411, 431, 548, 685, 822, 862, 1096, 1233, 1293, 1370, 1644, 1724, 2055, 2155, 2466, 2586, 2740, 3288, 3448, 3879, 4110, 4310, 4932, 5172, 5480, 6165, 6465, 7758, 8220, 8620, 9864, 10344, 12330, 12930, 15516, 16440, 17240, 19395, 24660, 25860, 31032, 38790, 49320, 51720, 59047, 77580, 118094, 155160, 177141, 236188, 295235, 354282, 472376, 531423, 590470, 708564, 885705, 1062846, 1180940, 1417128, 1771410, 2125692, 2361880, 2657115, 3542820, 4251384, 5314230, 7085640, 10628460, 21256920]

約数ペア:

[(1, 21256920), (2, 10628460), (3, 7085640), (4, 5314230), (5, 4251384), (6, 3542820), (8, 2657115), (9, 2361880), (10, 2125692), (12, 1771410), (15, 1417128), (18, 1180940), (20, 1062846), (24, 885705), (30, 708564), (36, 590470), (40, 531423), (45, 472376), (60, 354282), (72, 295235), (90, 236188), (120, 177141), (137, 155160), (180, 118094), (274, 77580), (360, 59047), (411, 51720), (431, 49320), (548, 38790), (685, 31032), (822, 25860), (862, 24660), (1096, 19395), (1233, 17240), (1293, 16440), (1370, 15516), (1644, 12930), (1724, 12330), (2055, 10344), (2155, 9864), (2466, 8620), (2586, 8220), (2740, 7758), (3288, 6465), (3448, 6165), (3879, 5480), (4110, 5172), (4310, 4932)]