18881991

素因数分解:

$3^4\times {\mathrm{19}}^1\times {\mathrm{12269}}^1$

素因数の和:12300

約数の個数: 20

約数和(自身を含む): 29693400

約数和(自身を除く): 10811409

約数列:

[1, 3, 9, 19, 27, 57, 81, 171, 513, 1539, 12269, 36807, 110421, 233111, 331263, 699333, 993789, 2097999, 6293997, 18881991]

約数ペア:

[(1, 18881991), (3, 6293997), (9, 2097999), (19, 993789), (27, 699333), (57, 331263), (81, 233111), (171, 110421), (513, 36807), (1539, 12269)]