21148731

素因数分解:

$3^2\times {\mathrm{17}}^2\times {\mathrm{47}}^1\times {\mathrm{173}}^1$

素因数の和:260

約数の個数: 36

約数和(自身を含む): 33332832

約数和(自身を除く): 12184101

約数列:

[1, 3, 9, 17, 47, 51, 141, 153, 173, 289, 423, 519, 799, 867, 1557, 2397, 2601, 2941, 7191, 8131, 8823, 13583, 24393, 26469, 40749, 49997, 73179, 122247, 138227, 149991, 414681, 449973, 1244043, 2349859, 7049577, 21148731]

約数ペア:

[(1, 21148731), (3, 7049577), (9, 2349859), (17, 1244043), (47, 449973), (51, 414681), (141, 149991), (153, 138227), (173, 122247), (289, 73179), (423, 49997), (519, 40749), (799, 26469), (867, 24393), (1557, 13583), (2397, 8823), (2601, 8131), (2941, 7191)]