19780810

素因数分解:

$2^1\times 5^1\times 7^3\times {\mathrm{73}}^1\times {\mathrm{79}}^1$

素因数の和:180

約数の個数: 64

約数和(自身を含む): 42624000

約数和(自身を除く): 22843190

約数列:

[1, 2, 5, 7, 10, 14, 35, 49, 70, 73, 79, 98, 146, 158, 245, 343, 365, 395, 490, 511, 553, 686, 730, 790, 1022, 1106, 1715, 2555, 2765, 3430, 3577, 3871, 5110, 5530, 5767, 7154, 7742, 11534, 17885, 19355, 25039, 27097, 28835, 35770, 38710, 40369, 50078, 54194, 57670, 80738, 125195, 135485, 201845, 250390, 270970, 282583, 403690, 565166, 1412915, 1978081, 2825830, 3956162, 9890405, 19780810]

約数ペア:

[(1, 19780810), (2, 9890405), (5, 3956162), (7, 2825830), (10, 1978081), (14, 1412915), (35, 565166), (49, 403690), (70, 282583), (73, 270970), (79, 250390), (98, 201845), (146, 135485), (158, 125195), (245, 80738), (343, 57670), (365, 54194), (395, 50078), (490, 40369), (511, 38710), (553, 35770), (686, 28835), (730, 27097), (790, 25039), (1022, 19355), (1106, 17885), (1715, 11534), (2555, 7742), (2765, 7154), (3430, 5767), (3577, 5530), (3871, 5110)]