21870015

素因数分解:

$3^1\times 5^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{827}}^1$

素因数の和:919

約数の個数: 32

約数和(自身を含む): 36723456

約数和(自身を除く): 14853441

約数列:

[1, 3, 5, 15, 41, 43, 123, 129, 205, 215, 615, 645, 827, 1763, 2481, 4135, 5289, 8815, 12405, 26445, 33907, 35561, 101721, 106683, 169535, 177805, 508605, 533415, 1458001, 4374003, 7290005, 21870015]

約数ペア:

[(1, 21870015), (3, 7290005), (5, 4374003), (15, 1458001), (41, 533415), (43, 508605), (123, 177805), (129, 169535), (205, 106683), (215, 101721), (615, 35561), (645, 33907), (827, 26445), (1763, 12405), (2481, 8815), (4135, 5289)]