1291640

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{659}}^1$

素因数の和:684

約数の個数: 48

約数和(自身を含む): 3385800

約数和(自身を除く): 2094160

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 659, 980, 1318, 1960, 2636, 3295, 4613, 5272, 6590, 9226, 13180, 18452, 23065, 26360, 32291, 36904, 46130, 64582, 92260, 129164, 161455, 184520, 258328, 322910, 645820, 1291640]

約数ペア:

[(1, 1291640), (2, 645820), (4, 322910), (5, 258328), (7, 184520), (8, 161455), (10, 129164), (14, 92260), (20, 64582), (28, 46130), (35, 36904), (40, 32291), (49, 26360), (56, 23065), (70, 18452), (98, 13180), (140, 9226), (196, 6590), (245, 5272), (280, 4613), (392, 3295), (490, 2636), (659, 1960), (980, 1318)]