20513920

素因数分解:

$2^7\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{241}}^1$

素因数の和:286

約数の個数: 128

約数和(自身を含む): 59241600

約数和(自身を除く): 38727680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 19, 20, 28, 32, 35, 38, 40, 56, 64, 70, 76, 80, 95, 112, 128, 133, 140, 152, 160, 190, 224, 241, 266, 280, 304, 320, 380, 448, 482, 532, 560, 608, 640, 665, 760, 896, 964, 1064, 1120, 1205, 1216, 1330, 1520, 1687, 1928, 2128, 2240, 2410, 2432, 2660, 3040, 3374, 3856, 4256, 4480, 4579, 4820, 5320, 6080, 6748, 7712, 8435, 8512, 9158, 9640, 10640, 12160, 13496, 15424, 16870, 17024, 18316, 19280, 21280, 22895, 26992, 30848, 32053, 33740, 36632, 38560, 42560, 45790, 53984, 64106, 67480, 73264, 77120, 85120, 91580, 107968, 128212, 134960, 146528, 154240, 160265, 183160, 215936, 256424, 269920, 293056, 320530, 366320, 512848, 539840, 586112, 641060, 732640, 1025696, 1079680, 1282120, 1465280, 2051392, 2564240, 2930560, 4102784, 5128480, 10256960, 20513920]

約数ペア:

[(1, 20513920), (2, 10256960), (4, 5128480), (5, 4102784), (7, 2930560), (8, 2564240), (10, 2051392), (14, 1465280), (16, 1282120), (19, 1079680), (20, 1025696), (28, 732640), (32, 641060), (35, 586112), (38, 539840), (40, 512848), (56, 366320), (64, 320530), (70, 293056), (76, 269920), (80, 256424), (95, 215936), (112, 183160), (128, 160265), (133, 154240), (140, 146528), (152, 134960), (160, 128212), (190, 107968), (224, 91580), (241, 85120), (266, 77120), (280, 73264), (304, 67480), (320, 64106), (380, 53984), (448, 45790), (482, 42560), (532, 38560), (560, 36632), (608, 33740), (640, 32053), (665, 30848), (760, 26992), (896, 22895), (964, 21280), (1064, 19280), (1120, 18316), (1205, 17024), (1216, 16870), (1330, 15424), (1520, 13496), (1687, 12160), (1928, 10640), (2128, 9640), (2240, 9158), (2410, 8512), (2432, 8435), (2660, 7712), (3040, 6748), (3374, 6080), (3856, 5320), (4256, 4820), (4480, 4579)]