20994981

素因数分解:

$3^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{7517}}^1$

素因数の和:7553

約数の個数: 24

約数和(自身を含む): 34282080

約数和(自身を除く): 13287099

約数列:

[1, 3, 7, 19, 21, 49, 57, 133, 147, 399, 931, 2793, 7517, 22551, 52619, 142823, 157857, 368333, 428469, 999761, 1104999, 2999283, 6998327, 20994981]

約数ペア:

[(1, 20994981), (3, 6998327), (7, 2999283), (19, 1104999), (21, 999761), (49, 428469), (57, 368333), (133, 157857), (147, 142823), (399, 52619), (931, 22551), (2793, 7517)]