21427780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{173}}^1\times {\mathrm{563}}^1$

素因数の和:756

約数の個数: 48

約数和(自身を含む): 49460544

約数和(自身を除く): 28032764

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 173, 220, 346, 563, 692, 865, 1126, 1730, 1903, 2252, 2815, 3460, 3806, 5630, 6193, 7612, 9515, 11260, 12386, 19030, 24772, 30965, 38060, 61930, 97399, 123860, 194798, 389596, 486995, 973990, 1071389, 1947980, 2142778, 4285556, 5356945, 10713890, 21427780]

約数ペア:

[(1, 21427780), (2, 10713890), (4, 5356945), (5, 4285556), (10, 2142778), (11, 1947980), (20, 1071389), (22, 973990), (44, 486995), (55, 389596), (110, 194798), (173, 123860), (220, 97399), (346, 61930), (563, 38060), (692, 30965), (865, 24772), (1126, 19030), (1730, 12386), (1903, 11260), (2252, 9515), (2815, 7612), (3460, 6193), (3806, 5630)]