28402840

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1\times {\mathrm{137}}^1$

素因数の和:292

約数の個数: 64

約数和(自身を含む): 66173760

約数和(自身を除く): 37770920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 73, 137, 142, 146, 274, 284, 292, 355, 365, 548, 568, 584, 685, 710, 730, 1096, 1370, 1420, 1460, 2740, 2840, 2920, 5183, 5480, 9727, 10001, 10366, 19454, 20002, 20732, 25915, 38908, 40004, 41464, 48635, 50005, 51830, 77816, 80008, 97270, 100010, 103660, 194540, 200020, 207320, 389080, 400040, 710071, 1420142, 2840284, 3550355, 5680568, 7100710, 14201420, 28402840]

約数ペア:

[(1, 28402840), (2, 14201420), (4, 7100710), (5, 5680568), (8, 3550355), (10, 2840284), (20, 1420142), (40, 710071), (71, 400040), (73, 389080), (137, 207320), (142, 200020), (146, 194540), (274, 103660), (284, 100010), (292, 97270), (355, 80008), (365, 77816), (548, 51830), (568, 50005), (584, 48635), (685, 41464), (710, 40004), (730, 38908), (1096, 25915), (1370, 20732), (1420, 20002), (1460, 19454), (2740, 10366), (2840, 10001), (2920, 9727), (5183, 5480)]