21181360

素因数分解:

$2^4\times 5^1\times {\mathrm{271}}^1\times {\mathrm{977}}^1$

素因数の和:1261

約数の個数: 40

約数和(自身を含む): 49478976

約数和(自身を除く): 28297616

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 271, 542, 977, 1084, 1355, 1954, 2168, 2710, 3908, 4336, 4885, 5420, 7816, 9770, 10840, 15632, 19540, 21680, 39080, 78160, 264767, 529534, 1059068, 1323835, 2118136, 2647670, 4236272, 5295340, 10590680, 21181360]

約数ペア:

[(1, 21181360), (2, 10590680), (4, 5295340), (5, 4236272), (8, 2647670), (10, 2118136), (16, 1323835), (20, 1059068), (40, 529534), (80, 264767), (271, 78160), (542, 39080), (977, 21680), (1084, 19540), (1355, 15632), (1954, 10840), (2168, 9770), (2710, 7816), (3908, 5420), (4336, 4885)]