21855280

素因数分解:

$2^4\times 5^1\times {\mathrm{257}}^1\times {\mathrm{1063}}^1$

素因数の和:1333

約数の個数: 40

約数和(自身を含む): 51059232

約数和(自身を除く): 29203952

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 257, 514, 1028, 1063, 1285, 2056, 2126, 2570, 4112, 4252, 5140, 5315, 8504, 10280, 10630, 17008, 20560, 21260, 42520, 85040, 273191, 546382, 1092764, 1365955, 2185528, 2731910, 4371056, 5463820, 10927640, 21855280]

約数ペア:

[(1, 21855280), (2, 10927640), (4, 5463820), (5, 4371056), (8, 2731910), (10, 2185528), (16, 1365955), (20, 1092764), (40, 546382), (80, 273191), (257, 85040), (514, 42520), (1028, 21260), (1063, 20560), (1285, 17008), (2056, 10630), (2126, 10280), (2570, 8504), (4112, 5315), (4252, 5140)]