21637960

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{401}}^1$

素因数の和:502

約数の個数: 64

約数和(自身を含む): 52099200

約数和(自身を除く): 30461240

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 38, 40, 71, 76, 95, 142, 152, 190, 284, 355, 380, 401, 568, 710, 760, 802, 1349, 1420, 1604, 2005, 2698, 2840, 3208, 4010, 5396, 6745, 7619, 8020, 10792, 13490, 15238, 16040, 26980, 28471, 30476, 38095, 53960, 56942, 60952, 76190, 113884, 142355, 152380, 227768, 284710, 304760, 540949, 569420, 1081898, 1138840, 2163796, 2704745, 4327592, 5409490, 10818980, 21637960]

約数ペア:

[(1, 21637960), (2, 10818980), (4, 5409490), (5, 4327592), (8, 2704745), (10, 2163796), (19, 1138840), (20, 1081898), (38, 569420), (40, 540949), (71, 304760), (76, 284710), (95, 227768), (142, 152380), (152, 142355), (190, 113884), (284, 76190), (355, 60952), (380, 56942), (401, 53960), (568, 38095), (710, 30476), (760, 28471), (802, 26980), (1349, 16040), (1420, 15238), (1604, 13490), (2005, 10792), (2698, 8020), (2840, 7619), (3208, 6745), (4010, 5396)]