21031281

素因数分解:

$3^2\times {\mathrm{37}}^1\times {\mathrm{137}}^1\times {\mathrm{461}}^1$

素因数の和:641

約数の個数: 24

約数和(自身を含む): 31495464

約数和(自身を除く): 10464183

約数列:

[1, 3, 9, 37, 111, 137, 333, 411, 461, 1233, 1383, 4149, 5069, 15207, 17057, 45621, 51171, 63157, 153513, 189471, 568413, 2336809, 7010427, 21031281]

約数ペア:

[(1, 21031281), (3, 7010427), (9, 2336809), (37, 568413), (111, 189471), (137, 153513), (333, 63157), (411, 51171), (461, 45621), (1233, 17057), (1383, 15207), (4149, 5069)]