21791187

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{661}}^1$

素因数の和:721

約数の個数: 40

約数和(自身を含む): 36526512

約数和(自身を除く): 14735325

約数列:

[1, 3, 9, 11, 27, 33, 37, 81, 99, 111, 297, 333, 407, 661, 891, 999, 1221, 1983, 2997, 3663, 5949, 7271, 10989, 17847, 21813, 24457, 32967, 53541, 65439, 73371, 196317, 220113, 269027, 588951, 660339, 807081, 1981017, 2421243, 7263729, 21791187]

約数ペア:

[(1, 21791187), (3, 7263729), (9, 2421243), (11, 1981017), (27, 807081), (33, 660339), (37, 588951), (81, 269027), (99, 220113), (111, 196317), (297, 73371), (333, 65439), (407, 53541), (661, 32967), (891, 24457), (999, 21813), (1221, 17847), (1983, 10989), (2997, 7271), (3663, 5949)]