81589820

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{101}}^1\times {\mathrm{239}}^1$

素因数の和:375

約数の個数: 72

約数和(自身を含む): 188153280

約数和(自身を除く): 106563460

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 101, 130, 169, 202, 239, 260, 338, 404, 478, 505, 676, 845, 956, 1010, 1195, 1313, 1690, 2020, 2390, 2626, 3107, 3380, 4780, 5252, 6214, 6565, 12428, 13130, 15535, 17069, 24139, 26260, 31070, 34138, 40391, 48278, 62140, 68276, 80782, 85345, 96556, 120695, 161564, 170690, 201955, 241390, 313807, 341380, 403910, 482780, 627614, 807820, 1255228, 1569035, 3138070, 4079491, 6276140, 8158982, 16317964, 20397455, 40794910, 81589820]

約数ペア:

[(1, 81589820), (2, 40794910), (4, 20397455), (5, 16317964), (10, 8158982), (13, 6276140), (20, 4079491), (26, 3138070), (52, 1569035), (65, 1255228), (101, 807820), (130, 627614), (169, 482780), (202, 403910), (239, 341380), (260, 313807), (338, 241390), (404, 201955), (478, 170690), (505, 161564), (676, 120695), (845, 96556), (956, 85345), (1010, 80782), (1195, 68276), (1313, 62140), (1690, 48278), (2020, 40391), (2390, 34138), (2626, 31070), (3107, 26260), (3380, 24139), (4780, 17069), (5252, 15535), (6214, 13130), (6565, 12428)]