81312560

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{20743}}^1$

素因数の和:20770

約数の個数: 60

約数和(自身を含む): 219927888

約数和(自身を除く): 138615328

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 49, 56, 70, 80, 98, 112, 140, 196, 245, 280, 392, 490, 560, 784, 980, 1960, 3920, 20743, 41486, 82972, 103715, 145201, 165944, 207430, 290402, 331888, 414860, 580804, 726005, 829720, 1016407, 1161608, 1452010, 1659440, 2032814, 2323216, 2904020, 4065628, 5082035, 5808040, 8131256, 10164070, 11616080, 16262512, 20328140, 40656280, 81312560]

約数ペア:

[(1, 81312560), (2, 40656280), (4, 20328140), (5, 16262512), (7, 11616080), (8, 10164070), (10, 8131256), (14, 5808040), (16, 5082035), (20, 4065628), (28, 2904020), (35, 2323216), (40, 2032814), (49, 1659440), (56, 1452010), (70, 1161608), (80, 1016407), (98, 829720), (112, 726005), (140, 580804), (196, 414860), (245, 331888), (280, 290402), (392, 207430), (490, 165944), (560, 145201), (784, 103715), (980, 82972), (1960, 41486), (3920, 20743)]