20818880

素因数分解:

$2^6\times 5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1$

素因数の和:166

約数の個数: 112

約数和(自身を含む): 54315360

約数和(自身を除く): 33496480

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 43, 64, 68, 80, 85, 86, 89, 136, 160, 170, 172, 178, 215, 272, 320, 340, 344, 356, 430, 445, 544, 680, 688, 712, 731, 860, 890, 1088, 1360, 1376, 1424, 1462, 1513, 1720, 1780, 2720, 2752, 2848, 2924, 3026, 3440, 3560, 3655, 3827, 5440, 5696, 5848, 6052, 6880, 7120, 7310, 7565, 7654, 11696, 12104, 13760, 14240, 14620, 15130, 15308, 19135, 23392, 24208, 28480, 29240, 30260, 30616, 38270, 46784, 48416, 58480, 60520, 61232, 65059, 76540, 96832, 116960, 121040, 122464, 130118, 153080, 233920, 242080, 244928, 260236, 306160, 325295, 484160, 520472, 612320, 650590, 1040944, 1224640, 1301180, 2081888, 2602360, 4163776, 5204720, 10409440, 20818880]

約数ペア:

[(1, 20818880), (2, 10409440), (4, 5204720), (5, 4163776), (8, 2602360), (10, 2081888), (16, 1301180), (17, 1224640), (20, 1040944), (32, 650590), (34, 612320), (40, 520472), (43, 484160), (64, 325295), (68, 306160), (80, 260236), (85, 244928), (86, 242080), (89, 233920), (136, 153080), (160, 130118), (170, 122464), (172, 121040), (178, 116960), (215, 96832), (272, 76540), (320, 65059), (340, 61232), (344, 60520), (356, 58480), (430, 48416), (445, 46784), (544, 38270), (680, 30616), (688, 30260), (712, 29240), (731, 28480), (860, 24208), (890, 23392), (1088, 19135), (1360, 15308), (1376, 15130), (1424, 14620), (1462, 14240), (1513, 13760), (1720, 12104), (1780, 11696), (2720, 7654), (2752, 7565), (2848, 7310), (2924, 7120), (3026, 6880), (3440, 6052), (3560, 5848), (3655, 5696), (3827, 5440)]