21715215

素因数分解:

$3^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{131}}^1\times {\mathrm{257}}^1$

素因数の和:439

約数の個数: 32

約数和(自身を含む): 35963136

約数和(自身を除く): 14247921

約数列:

[1, 3, 5, 15, 43, 129, 131, 215, 257, 393, 645, 655, 771, 1285, 1965, 3855, 5633, 11051, 16899, 28165, 33153, 33667, 55255, 84495, 101001, 165765, 168335, 505005, 1447681, 4343043, 7238405, 21715215]

約数ペア:

[(1, 21715215), (3, 7238405), (5, 4343043), (15, 1447681), (43, 505005), (129, 168335), (131, 165765), (215, 101001), (257, 84495), (393, 55255), (645, 33667), (655, 33153), (771, 28165), (1285, 16899), (1965, 11051), (3855, 5633)]