20496640

素因数分解:

$2^8\times 5^1\times {\mathrm{67}}^1\times {\mathrm{239}}^1$

素因数の和:327

約数の個数: 72

約数和(自身を含む): 50037120

約数和(自身を除く): 29540480

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 67, 80, 128, 134, 160, 239, 256, 268, 320, 335, 478, 536, 640, 670, 956, 1072, 1195, 1280, 1340, 1912, 2144, 2390, 2680, 3824, 4288, 4780, 5360, 7648, 8576, 9560, 10720, 15296, 16013, 17152, 19120, 21440, 30592, 32026, 38240, 42880, 61184, 64052, 76480, 80065, 85760, 128104, 152960, 160130, 256208, 305920, 320260, 512416, 640520, 1024832, 1281040, 2049664, 2562080, 4099328, 5124160, 10248320, 20496640]

約数ペア:

[(1, 20496640), (2, 10248320), (4, 5124160), (5, 4099328), (8, 2562080), (10, 2049664), (16, 1281040), (20, 1024832), (32, 640520), (40, 512416), (64, 320260), (67, 305920), (80, 256208), (128, 160130), (134, 152960), (160, 128104), (239, 85760), (256, 80065), (268, 76480), (320, 64052), (335, 61184), (478, 42880), (536, 38240), (640, 32026), (670, 30592), (956, 21440), (1072, 19120), (1195, 17152), (1280, 16013), (1340, 15296), (1912, 10720), (2144, 9560), (2390, 8576), (2680, 7648), (3824, 5360), (4288, 4780)]