21780171

素因数分解:

$3^4\times 7^1\times {\mathrm{107}}^1\times {\mathrm{359}}^1$

素因数の和:485

約数の個数: 40

約数和(自身を含む): 37635840

約数和(自身を除く): 15855669

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 107, 189, 321, 359, 567, 749, 963, 1077, 2247, 2513, 2889, 3231, 6741, 7539, 8667, 9693, 20223, 22617, 29079, 38413, 60669, 67851, 115239, 203553, 268891, 345717, 806673, 1037151, 2420019, 3111453, 7260057, 21780171]

約数ペア:

[(1, 21780171), (3, 7260057), (7, 3111453), (9, 2420019), (21, 1037151), (27, 806673), (63, 345717), (81, 268891), (107, 203553), (189, 115239), (321, 67851), (359, 60669), (567, 38413), (749, 29079), (963, 22617), (1077, 20223), (2247, 9693), (2513, 8667), (2889, 7539), (3231, 6741)]