21080320

素因数分解:

$2^8\times 5^1\times {\mathrm{43}}^1\times {\mathrm{383}}^1$

素因数の和:447

約数の個数: 72

約数和(自身を含む): 51803136

約数和(自身を除く): 30722816

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 43, 64, 80, 86, 128, 160, 172, 215, 256, 320, 344, 383, 430, 640, 688, 766, 860, 1280, 1376, 1532, 1720, 1915, 2752, 3064, 3440, 3830, 5504, 6128, 6880, 7660, 11008, 12256, 13760, 15320, 16469, 24512, 27520, 30640, 32938, 49024, 55040, 61280, 65876, 82345, 98048, 122560, 131752, 164690, 245120, 263504, 329380, 490240, 527008, 658760, 1054016, 1317520, 2108032, 2635040, 4216064, 5270080, 10540160, 21080320]

約数ペア:

[(1, 21080320), (2, 10540160), (4, 5270080), (5, 4216064), (8, 2635040), (10, 2108032), (16, 1317520), (20, 1054016), (32, 658760), (40, 527008), (43, 490240), (64, 329380), (80, 263504), (86, 245120), (128, 164690), (160, 131752), (172, 122560), (215, 98048), (256, 82345), (320, 65876), (344, 61280), (383, 55040), (430, 49024), (640, 32938), (688, 30640), (766, 27520), (860, 24512), (1280, 16469), (1376, 15320), (1532, 13760), (1720, 12256), (1915, 11008), (2752, 7660), (3064, 6880), (3440, 6128), (3830, 5504)]