21500000

素因数分解:

$2^5\times 5^6\times {\mathrm{43}}^1$

素因数の和:83

約数の個数: 84

約数和(自身を含む): 54139932

約数和(自身を除く): 32639932

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 43, 50, 80, 86, 100, 125, 160, 172, 200, 215, 250, 344, 400, 430, 500, 625, 688, 800, 860, 1000, 1075, 1250, 1376, 1720, 2000, 2150, 2500, 3125, 3440, 4000, 4300, 5000, 5375, 6250, 6880, 8600, 10000, 10750, 12500, 15625, 17200, 20000, 21500, 25000, 26875, 31250, 34400, 43000, 50000, 53750, 62500, 86000, 100000, 107500, 125000, 134375, 172000, 215000, 250000, 268750, 430000, 500000, 537500, 671875, 860000, 1075000, 1343750, 2150000, 2687500, 4300000, 5375000, 10750000, 21500000]

約数ペア:

[(1, 21500000), (2, 10750000), (4, 5375000), (5, 4300000), (8, 2687500), (10, 2150000), (16, 1343750), (20, 1075000), (25, 860000), (32, 671875), (40, 537500), (43, 500000), (50, 430000), (80, 268750), (86, 250000), (100, 215000), (125, 172000), (160, 134375), (172, 125000), (200, 107500), (215, 100000), (250, 86000), (344, 62500), (400, 53750), (430, 50000), (500, 43000), (625, 34400), (688, 31250), (800, 26875), (860, 25000), (1000, 21500), (1075, 20000), (1250, 17200), (1376, 15625), (1720, 12500), (2000, 10750), (2150, 10000), (2500, 8600), (3125, 6880), (3440, 6250), (4000, 5375), (4300, 5000)]