21580749

素因数分解:

$3^4\times {\mathrm{157}}^1\times {\mathrm{1697}}^1$

素因数の和:1866

約数の個数: 20

約数和(自身を含む): 32462364

約数和(自身を除く): 10881615

約数列:

[1, 3, 9, 27, 81, 157, 471, 1413, 1697, 4239, 5091, 12717, 15273, 45819, 137457, 266429, 799287, 2397861, 7193583, 21580749]

約数ペア:

[(1, 21580749), (3, 7193583), (9, 2397861), (27, 799287), (81, 266429), (157, 137457), (471, 45819), (1413, 15273), (1697, 12717), (4239, 5091)]