21389991

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{53609}}^1$

素因数の和:53638

約数の個数: 16

約数和(自身を含む): 34310400

約数和(自身を除く): 12920409

約数列:

[1, 3, 7, 19, 21, 57, 133, 399, 53609, 160827, 375263, 1018571, 1125789, 3055713, 7129997, 21389991]

約数ペア:

[(1, 21389991), (3, 7129997), (7, 3055713), (19, 1125789), (21, 1018571), (57, 375263), (133, 160827), (399, 53609)]