19990557

素因数分解:

$3^4\times {\mathrm{47}}^1\times {\mathrm{59}}^1\times {\mathrm{89}}^1$

素因数の和:207

約数の個数: 40

約数和(自身を含む): 31363200

約数和(自身を除く): 11372643

約数列:

[1, 3, 9, 27, 47, 59, 81, 89, 141, 177, 267, 423, 531, 801, 1269, 1593, 2403, 2773, 3807, 4183, 4779, 5251, 7209, 8319, 12549, 15753, 24957, 37647, 47259, 74871, 112941, 141777, 224613, 246797, 338823, 425331, 740391, 2221173, 6663519, 19990557]

約数ペア:

[(1, 19990557), (3, 6663519), (9, 2221173), (27, 740391), (47, 425331), (59, 338823), (81, 246797), (89, 224613), (141, 141777), (177, 112941), (267, 74871), (423, 47259), (531, 37647), (801, 24957), (1269, 15753), (1593, 12549), (2403, 8319), (2773, 7209), (3807, 5251), (4183, 4779)]