21274281

素因数分解:

$3^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{2539}}^1$

素因数の和:2578

約数の個数: 36

約数和(自身を含む): 37642800

約数和(自身を除く): 16368519

約数列:

[1, 3, 7, 9, 19, 21, 49, 57, 63, 133, 147, 171, 399, 441, 931, 1197, 2539, 2793, 7617, 8379, 17773, 22851, 48241, 53319, 124411, 144723, 159957, 337687, 373233, 434169, 1013061, 1119699, 2363809, 3039183, 7091427, 21274281]

約数ペア:

[(1, 21274281), (3, 7091427), (7, 3039183), (9, 2363809), (19, 1119699), (21, 1013061), (49, 434169), (57, 373233), (63, 337687), (133, 159957), (147, 144723), (171, 124411), (399, 53319), (441, 48241), (931, 22851), (1197, 17773), (2539, 8379), (2793, 7617)]