20628340

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1\times {\mathrm{199}}^1$

素因数の和:352

約数の個数: 48

約数和(自身を含む): 44755200

約数和(自身を除く): 24126860

約数列:

[1, 2, 4, 5, 10, 20, 71, 73, 142, 146, 199, 284, 292, 355, 365, 398, 710, 730, 796, 995, 1420, 1460, 1990, 3980, 5183, 10366, 14129, 14527, 20732, 25915, 28258, 29054, 51830, 56516, 58108, 70645, 72635, 103660, 141290, 145270, 282580, 290540, 1031417, 2062834, 4125668, 5157085, 10314170, 20628340]

約数ペア:

[(1, 20628340), (2, 10314170), (4, 5157085), (5, 4125668), (10, 2062834), (20, 1031417), (71, 290540), (73, 282580), (142, 145270), (146, 141290), (199, 103660), (284, 72635), (292, 70645), (355, 58108), (365, 56516), (398, 51830), (710, 29054), (730, 28258), (796, 25915), (995, 20732), (1420, 14527), (1460, 14129), (1990, 10366), (3980, 5183)]