256989640

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{349}}^1\times {\mathrm{449}}^1$

素因数の和:850

約数の個数: 64

約数和(自身を含む): 595350000

約数和(自身を除く): 338360360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 349, 410, 449, 698, 820, 898, 1396, 1640, 1745, 1796, 2245, 2792, 3490, 3592, 4490, 6980, 8980, 13960, 14309, 17960, 18409, 28618, 36818, 57236, 71545, 73636, 92045, 114472, 143090, 147272, 156701, 184090, 286180, 313402, 368180, 572360, 626804, 736360, 783505, 1253608, 1567010, 3134020, 6268040, 6424741, 12849482, 25698964, 32123705, 51397928, 64247410, 128494820, 256989640]

約数ペア:

[(1, 256989640), (2, 128494820), (4, 64247410), (5, 51397928), (8, 32123705), (10, 25698964), (20, 12849482), (40, 6424741), (41, 6268040), (82, 3134020), (164, 1567010), (205, 1253608), (328, 783505), (349, 736360), (410, 626804), (449, 572360), (698, 368180), (820, 313402), (898, 286180), (1396, 184090), (1640, 156701), (1745, 147272), (1796, 143090), (2245, 114472), (2792, 92045), (3490, 73636), (3592, 71545), (4490, 57236), (6980, 36818), (8980, 28618), (13960, 18409), (14309, 17960)]