80821220

素因数分解:

$2^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{197}}^1\times {\mathrm{281}}^1$

素因数の和:560

約数の個数: 48

約数和(自身を含む): 173538288

約数和(自身を除く): 92717068

約数列:

[1, 2, 4, 5, 10, 20, 73, 146, 197, 281, 292, 365, 394, 562, 730, 788, 985, 1124, 1405, 1460, 1970, 2810, 3940, 5620, 14381, 20513, 28762, 41026, 55357, 57524, 71905, 82052, 102565, 110714, 143810, 205130, 221428, 276785, 287620, 410260, 553570, 1107140, 4041061, 8082122, 16164244, 20205305, 40410610, 80821220]

約数ペア:

[(1, 80821220), (2, 40410610), (4, 20205305), (5, 16164244), (10, 8082122), (20, 4041061), (73, 1107140), (146, 553570), (197, 410260), (281, 287620), (292, 276785), (365, 221428), (394, 205130), (562, 143810), (730, 110714), (788, 102565), (985, 82052), (1124, 71905), (1405, 57524), (1460, 55357), (1970, 41026), (2810, 28762), (3940, 20513), (5620, 14381)]