21489920

素因数分解:

$2^8\times 5^1\times {\mathrm{103}}^1\times {\mathrm{163}}^1$

素因数の和:287

約数の個数: 72

約数和(自身を含む): 52293696

約数和(自身を除く): 30803776

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 103, 128, 160, 163, 206, 256, 320, 326, 412, 515, 640, 652, 815, 824, 1030, 1280, 1304, 1630, 1648, 2060, 2608, 3260, 3296, 4120, 5216, 6520, 6592, 8240, 10432, 13040, 13184, 16480, 16789, 20864, 26080, 26368, 32960, 33578, 41728, 52160, 65920, 67156, 83945, 104320, 131840, 134312, 167890, 208640, 268624, 335780, 537248, 671560, 1074496, 1343120, 2148992, 2686240, 4297984, 5372480, 10744960, 21489920]

約数ペア:

[(1, 21489920), (2, 10744960), (4, 5372480), (5, 4297984), (8, 2686240), (10, 2148992), (16, 1343120), (20, 1074496), (32, 671560), (40, 537248), (64, 335780), (80, 268624), (103, 208640), (128, 167890), (160, 134312), (163, 131840), (206, 104320), (256, 83945), (320, 67156), (326, 65920), (412, 52160), (515, 41728), (640, 33578), (652, 32960), (815, 26368), (824, 26080), (1030, 20864), (1280, 16789), (1304, 16480), (1630, 13184), (1648, 13040), (2060, 10432), (2608, 8240), (3260, 6592), (3296, 6520), (4120, 5216)]