899990

素因数分解:

$2^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1$

素因数の和:93

約数の個数: 64

約数和(自身を含む): 2128896

約数和(自身を除く): 1228906

約数列:

[1, 2, 5, 7, 10, 13, 14, 23, 26, 35, 43, 46, 65, 70, 86, 91, 115, 130, 161, 182, 215, 230, 299, 301, 322, 430, 455, 559, 598, 602, 805, 910, 989, 1118, 1495, 1505, 1610, 1978, 2093, 2795, 2990, 3010, 3913, 4186, 4945, 5590, 6923, 7826, 9890, 10465, 12857, 13846, 19565, 20930, 25714, 34615, 39130, 64285, 69230, 89999, 128570, 179998, 449995, 899990]

約数ペア:

[(1, 899990), (2, 449995), (5, 179998), (7, 128570), (10, 89999), (13, 69230), (14, 64285), (23, 39130), (26, 34615), (35, 25714), (43, 20930), (46, 19565), (65, 13846), (70, 12857), (86, 10465), (91, 9890), (115, 7826), (130, 6923), (161, 5590), (182, 4945), (215, 4186), (230, 3913), (299, 3010), (301, 2990), (322, 2795), (430, 2093), (455, 1978), (559, 1610), (598, 1505), (602, 1495), (805, 1118), (910, 989)]