20369920

素因数分解:

$2^9\times 5^1\times {\mathrm{73}}^1\times {\mathrm{109}}^1$

素因数の和:205

約数の個数: 80

約数和(自身を含む): 49963320

約数和(自身を除く): 29593400

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 73, 80, 109, 128, 146, 160, 218, 256, 292, 320, 365, 436, 512, 545, 584, 640, 730, 872, 1090, 1168, 1280, 1460, 1744, 2180, 2336, 2560, 2920, 3488, 4360, 4672, 5840, 6976, 7957, 8720, 9344, 11680, 13952, 15914, 17440, 18688, 23360, 27904, 31828, 34880, 37376, 39785, 46720, 55808, 63656, 69760, 79570, 93440, 127312, 139520, 159140, 186880, 254624, 279040, 318280, 509248, 636560, 1018496, 1273120, 2036992, 2546240, 4073984, 5092480, 10184960, 20369920]

約数ペア:

[(1, 20369920), (2, 10184960), (4, 5092480), (5, 4073984), (8, 2546240), (10, 2036992), (16, 1273120), (20, 1018496), (32, 636560), (40, 509248), (64, 318280), (73, 279040), (80, 254624), (109, 186880), (128, 159140), (146, 139520), (160, 127312), (218, 93440), (256, 79570), (292, 69760), (320, 63656), (365, 55808), (436, 46720), (512, 39785), (545, 37376), (584, 34880), (640, 31828), (730, 27904), (872, 23360), (1090, 18688), (1168, 17440), (1280, 15914), (1460, 13952), (1744, 11680), (2180, 9344), (2336, 8720), (2560, 7957), (2920, 6976), (3488, 5840), (4360, 4672)]