81977860

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{257}}^1\times {\mathrm{389}}^1$

素因数の和:696

約数の個数: 48

約数和(自身を含む): 177493680

約数和(自身を除く): 95515820

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 257, 389, 410, 514, 778, 820, 1028, 1285, 1556, 1945, 2570, 3890, 5140, 7780, 10537, 15949, 21074, 31898, 42148, 52685, 63796, 79745, 99973, 105370, 159490, 199946, 210740, 318980, 399892, 499865, 999730, 1999460, 4098893, 8197786, 16395572, 20494465, 40988930, 81977860]

約数ペア:

[(1, 81977860), (2, 40988930), (4, 20494465), (5, 16395572), (10, 8197786), (20, 4098893), (41, 1999460), (82, 999730), (164, 499865), (205, 399892), (257, 318980), (389, 210740), (410, 199946), (514, 159490), (778, 105370), (820, 99973), (1028, 79745), (1285, 63796), (1556, 52685), (1945, 42148), (2570, 31898), (3890, 21074), (5140, 15949), (7780, 10537)]