21390471

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{251}}^1\times {\mathrm{557}}^1$

素因数の和:831

約数の個数: 24

約数和(自身を含む): 32904144

約数和(自身を除く): 11513673

約数列:

[1, 3, 9, 17, 51, 153, 251, 557, 753, 1671, 2259, 4267, 5013, 9469, 12801, 28407, 38403, 85221, 139807, 419421, 1258263, 2376719, 7130157, 21390471]

約数ペア:

[(1, 21390471), (3, 7130157), (9, 2376719), (17, 1258263), (51, 419421), (153, 139807), (251, 85221), (557, 38403), (753, 28407), (1671, 12801), (2259, 9469), (4267, 5013)]