19999840

素因数分解:

$2^5\times 5^1\times 7^2\times {\mathrm{2551}}^1$

素因数の和:2580

約数の個数: 72

約数和(自身を含む): 54985392

約数和(自身を除く): 34985552

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 49, 56, 70, 80, 98, 112, 140, 160, 196, 224, 245, 280, 392, 490, 560, 784, 980, 1120, 1568, 1960, 2551, 3920, 5102, 7840, 10204, 12755, 17857, 20408, 25510, 35714, 40816, 51020, 71428, 81632, 89285, 102040, 124999, 142856, 178570, 204080, 249998, 285712, 357140, 408160, 499996, 571424, 624995, 714280, 999992, 1249990, 1428560, 1999984, 2499980, 2857120, 3999968, 4999960, 9999920, 19999840]

約数ペア:

[(1, 19999840), (2, 9999920), (4, 4999960), (5, 3999968), (7, 2857120), (8, 2499980), (10, 1999984), (14, 1428560), (16, 1249990), (20, 999992), (28, 714280), (32, 624995), (35, 571424), (40, 499996), (49, 408160), (56, 357140), (70, 285712), (80, 249998), (98, 204080), (112, 178570), (140, 142856), (160, 124999), (196, 102040), (224, 89285), (245, 81632), (280, 71428), (392, 51020), (490, 40816), (560, 35714), (784, 25510), (980, 20408), (1120, 17857), (1568, 12755), (1960, 10204), (2551, 7840), (3920, 5102)]