21009890

素因数分解:

$2^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{389}}^1\times {\mathrm{491}}^1$

素因数の和:898

約数の個数: 32

約数和(自身を含む): 41446080

約数和(自身を除く): 20436190

約数列:

[1, 2, 5, 10, 11, 22, 55, 110, 389, 491, 778, 982, 1945, 2455, 3890, 4279, 4910, 5401, 8558, 10802, 21395, 27005, 42790, 54010, 190999, 381998, 954995, 1909990, 2100989, 4201978, 10504945, 21009890]

約数ペア:

[(1, 21009890), (2, 10504945), (5, 4201978), (10, 2100989), (11, 1909990), (22, 954995), (55, 381998), (110, 190999), (389, 54010), (491, 42790), (778, 27005), (982, 21395), (1945, 10802), (2455, 8558), (3890, 5401), (4279, 4910)]