51720921

素因数分解:

$3^2\times 7^2\times {\mathrm{117281}}^1$

素因数の和:117301

約数の個数: 18

約数和(自身を含む): 86905962

約数和(自身を除く): 35185041

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 441, 117281, 351843, 820967, 1055529, 2462901, 5746769, 7388703, 17240307, 51720921]

約数ペア:

[(1, 51720921), (3, 17240307), (7, 7388703), (9, 5746769), (21, 2462901), (49, 1055529), (63, 820967), (147, 351843), (441, 117281)]