256451840

素因数分解:

$2^8\times 5^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{281}}^1$

素因数の和:356

約数の個数: 144

約数和(自身を含む): 664022016

約数和(自身を除く): 407570176

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 23, 31, 32, 40, 46, 62, 64, 80, 92, 115, 124, 128, 155, 160, 184, 230, 248, 256, 281, 310, 320, 368, 460, 496, 562, 620, 640, 713, 736, 920, 992, 1124, 1240, 1280, 1405, 1426, 1472, 1840, 1984, 2248, 2480, 2810, 2852, 2944, 3565, 3680, 3968, 4496, 4960, 5620, 5704, 5888, 6463, 7130, 7360, 7936, 8711, 8992, 9920, 11240, 11408, 12926, 14260, 14720, 17422, 17984, 19840, 22480, 22816, 25852, 28520, 29440, 32315, 34844, 35968, 39680, 43555, 44960, 45632, 51704, 57040, 64630, 69688, 71936, 87110, 89920, 91264, 103408, 114080, 129260, 139376, 174220, 179840, 182528, 200353, 206816, 228160, 258520, 278752, 348440, 359680, 400706, 413632, 456320, 517040, 557504, 696880, 801412, 827264, 912640, 1001765, 1034080, 1115008, 1393760, 1602824, 1654528, 2003530, 2068160, 2230016, 2787520, 3205648, 4007060, 4136320, 5575040, 6411296, 8014120, 8272640, 11150080, 12822592, 16028240, 25645184, 32056480, 51290368, 64112960, 128225920, 256451840]

約数ペア:

[(1, 256451840), (2, 128225920), (4, 64112960), (5, 51290368), (8, 32056480), (10, 25645184), (16, 16028240), (20, 12822592), (23, 11150080), (31, 8272640), (32, 8014120), (40, 6411296), (46, 5575040), (62, 4136320), (64, 4007060), (80, 3205648), (92, 2787520), (115, 2230016), (124, 2068160), (128, 2003530), (155, 1654528), (160, 1602824), (184, 1393760), (230, 1115008), (248, 1034080), (256, 1001765), (281, 912640), (310, 827264), (320, 801412), (368, 696880), (460, 557504), (496, 517040), (562, 456320), (620, 413632), (640, 400706), (713, 359680), (736, 348440), (920, 278752), (992, 258520), (1124, 228160), (1240, 206816), (1280, 200353), (1405, 182528), (1426, 179840), (1472, 174220), (1840, 139376), (1984, 129260), (2248, 114080), (2480, 103408), (2810, 91264), (2852, 89920), (2944, 87110), (3565, 71936), (3680, 69688), (3968, 64630), (4496, 57040), (4960, 51704), (5620, 45632), (5704, 44960), (5888, 43555), (6463, 39680), (7130, 35968), (7360, 34844), (7936, 32315), (8711, 29440), (8992, 28520), (9920, 25852), (11240, 22816), (11408, 22480), (12926, 19840), (14260, 17984), (14720, 17422)]