21290913

素因数分解:

$3^2\times 7^1\times {\mathrm{331}}^1\times {\mathrm{1021}}^1$

素因数の和:1365

約数の個数: 24

約数和(自身を含む): 35287616

約数和(自身を除く): 13996703

約数列:

[1, 3, 7, 9, 21, 63, 331, 993, 1021, 2317, 2979, 3063, 6951, 7147, 9189, 20853, 21441, 64323, 337951, 1013853, 2365657, 3041559, 7096971, 21290913]

約数ペア:

[(1, 21290913), (3, 7096971), (7, 3041559), (9, 2365657), (21, 1013853), (63, 337951), (331, 64323), (993, 21441), (1021, 20853), (2317, 9189), (2979, 7147), (3063, 6951)]