21250000

素因数分解:

$2^4\times 5^7\times {\mathrm{17}}^1$

素因数の和:60

約数の個数: 80

約数和(自身を含む): 54492048

約数和(自身を除く): 33242048

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 25, 34, 40, 50, 68, 80, 85, 100, 125, 136, 170, 200, 250, 272, 340, 400, 425, 500, 625, 680, 850, 1000, 1250, 1360, 1700, 2000, 2125, 2500, 3125, 3400, 4250, 5000, 6250, 6800, 8500, 10000, 10625, 12500, 15625, 17000, 21250, 25000, 31250, 34000, 42500, 50000, 53125, 62500, 78125, 85000, 106250, 125000, 156250, 170000, 212500, 250000, 265625, 312500, 425000, 531250, 625000, 850000, 1062500, 1250000, 1328125, 2125000, 2656250, 4250000, 5312500, 10625000, 21250000]

約数ペア:

[(1, 21250000), (2, 10625000), (4, 5312500), (5, 4250000), (8, 2656250), (10, 2125000), (16, 1328125), (17, 1250000), (20, 1062500), (25, 850000), (34, 625000), (40, 531250), (50, 425000), (68, 312500), (80, 265625), (85, 250000), (100, 212500), (125, 170000), (136, 156250), (170, 125000), (200, 106250), (250, 85000), (272, 78125), (340, 62500), (400, 53125), (425, 50000), (500, 42500), (625, 34000), (680, 31250), (850, 25000), (1000, 21250), (1250, 17000), (1360, 15625), (1700, 12500), (2000, 10625), (2125, 10000), (2500, 8500), (3125, 6800), (3400, 6250), (4250, 5000)]