20520171

素因数分解:

$3^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1$

素因数の和:149

約数の個数: 72

約数和(自身を含む): 37939200

約数和(自身を除く): 17419029

約数列:

[1, 3, 7, 9, 19, 21, 31, 49, 57, 63, 79, 93, 133, 147, 171, 217, 237, 279, 399, 441, 553, 589, 651, 711, 931, 1197, 1501, 1519, 1659, 1767, 1953, 2449, 2793, 3871, 4123, 4503, 4557, 4977, 5301, 7347, 8379, 10507, 11613, 12369, 13509, 13671, 17143, 22041, 28861, 31521, 34839, 37107, 46531, 51429, 73549, 86583, 94563, 120001, 139593, 154287, 220647, 259749, 325717, 360003, 418779, 661941, 977151, 1080009, 2280019, 2931453, 6840057, 20520171]

約数ペア:

[(1, 20520171), (3, 6840057), (7, 2931453), (9, 2280019), (19, 1080009), (21, 977151), (31, 661941), (49, 418779), (57, 360003), (63, 325717), (79, 259749), (93, 220647), (133, 154287), (147, 139593), (171, 120001), (217, 94563), (237, 86583), (279, 73549), (399, 51429), (441, 46531), (553, 37107), (589, 34839), (651, 31521), (711, 28861), (931, 22041), (1197, 17143), (1501, 13671), (1519, 13509), (1659, 12369), (1767, 11613), (1953, 10507), (2449, 8379), (2793, 7347), (3871, 5301), (4123, 4977), (4503, 4557)]