81007780

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{131}}^1\times {\mathrm{631}}^1$

素因数の和:785

約数の個数: 72

約数和(自身を含む): 199717056

約数和(自身を除く): 118709276

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 131, 140, 196, 245, 262, 490, 524, 631, 655, 917, 980, 1262, 1310, 1834, 2524, 2620, 3155, 3668, 4417, 4585, 6310, 6419, 8834, 9170, 12620, 12838, 17668, 18340, 22085, 25676, 30919, 32095, 44170, 61838, 64190, 82661, 88340, 123676, 128380, 154595, 165322, 309190, 330644, 413305, 578627, 618380, 826610, 1157254, 1653220, 2314508, 2893135, 4050389, 5786270, 8100778, 11572540, 16201556, 20251945, 40503890, 81007780]

約数ペア:

[(1, 81007780), (2, 40503890), (4, 20251945), (5, 16201556), (7, 11572540), (10, 8100778), (14, 5786270), (20, 4050389), (28, 2893135), (35, 2314508), (49, 1653220), (70, 1157254), (98, 826610), (131, 618380), (140, 578627), (196, 413305), (245, 330644), (262, 309190), (490, 165322), (524, 154595), (631, 128380), (655, 123676), (917, 88340), (980, 82661), (1262, 64190), (1310, 61838), (1834, 44170), (2524, 32095), (2620, 30919), (3155, 25676), (3668, 22085), (4417, 18340), (4585, 17668), (6310, 12838), (6419, 12620), (8834, 9170)]