20998880

素因数分解:

$2^5\times 5^1\times 7^1\times {\mathrm{18749}}^1$

素因数の和:18771

約数の個数: 48

約数和(自身を含む): 56700000

約数和(自身を除く): 35701120

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 56, 70, 80, 112, 140, 160, 224, 280, 560, 1120, 18749, 37498, 74996, 93745, 131243, 149992, 187490, 262486, 299984, 374980, 524972, 599968, 656215, 749960, 1049944, 1312430, 1499920, 2099888, 2624860, 2999840, 4199776, 5249720, 10499440, 20998880]

約数ペア:

[(1, 20998880), (2, 10499440), (4, 5249720), (5, 4199776), (7, 2999840), (8, 2624860), (10, 2099888), (14, 1499920), (16, 1312430), (20, 1049944), (28, 749960), (32, 656215), (35, 599968), (40, 524972), (56, 374980), (70, 299984), (80, 262486), (112, 187490), (140, 149992), (160, 131243), (224, 93745), (280, 74996), (560, 37498), (1120, 18749)]