21356451

素因数分解:

$3^2\times {\mathrm{67}}^1\times {\mathrm{107}}^1\times {\mathrm{331}}^1$

素因数の和:511

約数の個数: 24

約数和(自身を含む): 31696704

約数和(自身を除く): 10340253

約数列:

[1, 3, 9, 67, 107, 201, 321, 331, 603, 963, 993, 2979, 7169, 21507, 22177, 35417, 64521, 66531, 106251, 199593, 318753, 2372939, 7118817, 21356451]

約数ペア:

[(1, 21356451), (3, 7118817), (9, 2372939), (67, 318753), (107, 199593), (201, 106251), (321, 66531), (331, 64521), (603, 35417), (963, 22177), (993, 21507), (2979, 7169)]