21355520

素因数分解:

$2^{10}\times 5^1\times {\mathrm{43}}^1\times {\mathrm{97}}^1$

素因数の和:165

約数の個数: 88

約数和(自身を含む): 52959984

約数和(自身を除く): 31604464

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 43, 64, 80, 86, 97, 128, 160, 172, 194, 215, 256, 320, 344, 388, 430, 485, 512, 640, 688, 776, 860, 970, 1024, 1280, 1376, 1552, 1720, 1940, 2560, 2752, 3104, 3440, 3880, 4171, 5120, 5504, 6208, 6880, 7760, 8342, 11008, 12416, 13760, 15520, 16684, 20855, 22016, 24832, 27520, 31040, 33368, 41710, 44032, 49664, 55040, 62080, 66736, 83420, 99328, 110080, 124160, 133472, 166840, 220160, 248320, 266944, 333680, 496640, 533888, 667360, 1067776, 1334720, 2135552, 2669440, 4271104, 5338880, 10677760, 21355520]

約数ペア:

[(1, 21355520), (2, 10677760), (4, 5338880), (5, 4271104), (8, 2669440), (10, 2135552), (16, 1334720), (20, 1067776), (32, 667360), (40, 533888), (43, 496640), (64, 333680), (80, 266944), (86, 248320), (97, 220160), (128, 166840), (160, 133472), (172, 124160), (194, 110080), (215, 99328), (256, 83420), (320, 66736), (344, 62080), (388, 55040), (430, 49664), (485, 44032), (512, 41710), (640, 33368), (688, 31040), (776, 27520), (860, 24832), (970, 22016), (1024, 20855), (1280, 16684), (1376, 15520), (1552, 13760), (1720, 12416), (1940, 11008), (2560, 8342), (2752, 7760), (3104, 6880), (3440, 6208), (3880, 5504), (4171, 5120)]