19901990

素因数分解:

$2^1\times 5^1\times {\mathrm{73}}^1\times {\mathrm{137}}^1\times {\mathrm{199}}^1$

素因数の和:416

約数の個数: 32

約数和(自身を含む): 36763200

約数和(自身を除く): 16861210

約数列:

[1, 2, 5, 10, 73, 137, 146, 199, 274, 365, 398, 685, 730, 995, 1370, 1990, 10001, 14527, 20002, 27263, 29054, 50005, 54526, 72635, 100010, 136315, 145270, 272630, 1990199, 3980398, 9950995, 19901990]

約数ペア:

[(1, 19901990), (2, 9950995), (5, 3980398), (10, 1990199), (73, 272630), (137, 145270), (146, 136315), (199, 100010), (274, 72635), (365, 54526), (398, 50005), (685, 29054), (730, 27263), (995, 20002), (1370, 14527), (1990, 10001)]