21658240

素因数分解:

$2^7\times 5^1\times {\mathrm{43}}^1\times {\mathrm{787}}^1$

素因数の和:849

約数の個数: 64

約数和(自身を含む): 53048160

約数和(自身を除く): 31389920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 43, 64, 80, 86, 128, 160, 172, 215, 320, 344, 430, 640, 688, 787, 860, 1376, 1574, 1720, 2752, 3148, 3440, 3935, 5504, 6296, 6880, 7870, 12592, 13760, 15740, 25184, 27520, 31480, 33841, 50368, 62960, 67682, 100736, 125920, 135364, 169205, 251840, 270728, 338410, 503680, 541456, 676820, 1082912, 1353640, 2165824, 2707280, 4331648, 5414560, 10829120, 21658240]

約数ペア:

[(1, 21658240), (2, 10829120), (4, 5414560), (5, 4331648), (8, 2707280), (10, 2165824), (16, 1353640), (20, 1082912), (32, 676820), (40, 541456), (43, 503680), (64, 338410), (80, 270728), (86, 251840), (128, 169205), (160, 135364), (172, 125920), (215, 100736), (320, 67682), (344, 62960), (430, 50368), (640, 33841), (688, 31480), (787, 27520), (860, 25184), (1376, 15740), (1574, 13760), (1720, 12592), (2752, 7870), (3148, 6880), (3440, 6296), (3935, 5504)]