640520

素因数分解:

$2^3\times 5^1\times {\mathrm{67}}^1\times {\mathrm{239}}^1$

素因数の和:317

約数の個数: 32

約数和(自身を含む): 1468800

約数和(自身を除く): 828280

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 67, 134, 239, 268, 335, 478, 536, 670, 956, 1195, 1340, 1912, 2390, 2680, 4780, 9560, 16013, 32026, 64052, 80065, 128104, 160130, 320260, 640520]

約数ペア:

[(1, 640520), (2, 320260), (4, 160130), (5, 128104), (8, 80065), (10, 64052), (20, 32026), (40, 16013), (67, 9560), (134, 4780), (239, 2680), (268, 2390), (335, 1912), (478, 1340), (536, 1195), (670, 956)]