18878720

素因数分解:

$2^8\times 5^1\times 7^3\times {\mathrm{43}}^1$

素因数の和:85

約数の個数: 144

約数和(自身を含む): 53961600

約数和(自身を除く): 35082880

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 43, 49, 56, 64, 70, 80, 86, 98, 112, 128, 140, 160, 172, 196, 215, 224, 245, 256, 280, 301, 320, 343, 344, 392, 430, 448, 490, 560, 602, 640, 686, 688, 784, 860, 896, 980, 1120, 1204, 1280, 1372, 1376, 1505, 1568, 1715, 1720, 1792, 1960, 2107, 2240, 2408, 2744, 2752, 3010, 3136, 3430, 3440, 3920, 4214, 4480, 4816, 5488, 5504, 6020, 6272, 6860, 6880, 7840, 8428, 8960, 9632, 10535, 10976, 11008, 12040, 12544, 13720, 13760, 14749, 15680, 16856, 19264, 21070, 21952, 24080, 27440, 27520, 29498, 31360, 33712, 38528, 42140, 43904, 48160, 54880, 55040, 58996, 62720, 67424, 73745, 77056, 84280, 87808, 96320, 109760, 117992, 134848, 147490, 168560, 192640, 219520, 235984, 269696, 294980, 337120, 385280, 439040, 471968, 539392, 589960, 674240, 943936, 1179920, 1348480, 1887872, 2359840, 2696960, 3775744, 4719680, 9439360, 18878720]

約数ペア:

[(1, 18878720), (2, 9439360), (4, 4719680), (5, 3775744), (7, 2696960), (8, 2359840), (10, 1887872), (14, 1348480), (16, 1179920), (20, 943936), (28, 674240), (32, 589960), (35, 539392), (40, 471968), (43, 439040), (49, 385280), (56, 337120), (64, 294980), (70, 269696), (80, 235984), (86, 219520), (98, 192640), (112, 168560), (128, 147490), (140, 134848), (160, 117992), (172, 109760), (196, 96320), (215, 87808), (224, 84280), (245, 77056), (256, 73745), (280, 67424), (301, 62720), (320, 58996), (343, 55040), (344, 54880), (392, 48160), (430, 43904), (448, 42140), (490, 38528), (560, 33712), (602, 31360), (640, 29498), (686, 27520), (688, 27440), (784, 24080), (860, 21952), (896, 21070), (980, 19264), (1120, 16856), (1204, 15680), (1280, 14749), (1372, 13760), (1376, 13720), (1505, 12544), (1568, 12040), (1715, 11008), (1720, 10976), (1792, 10535), (1960, 9632), (2107, 8960), (2240, 8428), (2408, 7840), (2744, 6880), (2752, 6860), (3010, 6272), (3136, 6020), (3430, 5504), (3440, 5488), (3920, 4816), (4214, 4480)]