20784866560

素因数分解:

$2^8\times 5^1\times {\mathrm{983}}^1\times {\mathrm{16519}}^1$

素因数の和:17523

約数の個数: 72

約数和(自身を含む): 49839914880

約数和(自身を除く): 29055048320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 320, 640, 983, 1280, 1966, 3932, 4915, 7864, 9830, 15728, 16519, 19660, 31456, 33038, 39320, 62912, 66076, 78640, 82595, 125824, 132152, 157280, 165190, 251648, 264304, 314560, 330380, 528608, 629120, 660760, 1057216, 1258240, 1321520, 2114432, 2643040, 4228864, 5286080, 10572160, 16238177, 21144320, 32476354, 64952708, 81190885, 129905416, 162381770, 259810832, 324763540, 519621664, 649527080, 1039243328, 1299054160, 2078486656, 2598108320, 4156973312, 5196216640, 10392433280, 20784866560]

約数ペア:

[(1, 20784866560), (2, 10392433280), (4, 5196216640), (5, 4156973312), (8, 2598108320), (10, 2078486656), (16, 1299054160), (20, 1039243328), (32, 649527080), (40, 519621664), (64, 324763540), (80, 259810832), (128, 162381770), (160, 129905416), (256, 81190885), (320, 64952708), (640, 32476354), (983, 21144320), (1280, 16238177), (1966, 10572160), (3932, 5286080), (4915, 4228864), (7864, 2643040), (9830, 2114432), (15728, 1321520), (16519, 1258240), (19660, 1057216), (31456, 660760), (33038, 629120), (39320, 528608), (62912, 330380), (66076, 314560), (78640, 264304), (82595, 251648), (125824, 165190), (132152, 157280)]