19721961

素因数分解:

$3^4\times 7^2\times {\mathrm{4969}}^1$

素因数の和:4995

約数の個数: 30

約数和(自身を含む): 34278090

約数和(自身を除く): 14556129

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 81, 147, 189, 441, 567, 1323, 3969, 4969, 14907, 34783, 44721, 104349, 134163, 243481, 313047, 402489, 730443, 939141, 2191329, 2817423, 6573987, 19721961]

約数ペア:

[(1, 19721961), (3, 6573987), (7, 2817423), (9, 2191329), (21, 939141), (27, 730443), (49, 402489), (63, 313047), (81, 243481), (147, 134163), (189, 104349), (441, 44721), (567, 34783), (1323, 14907), (3969, 4969)]