21712131

素因数分解:

$3^4\times 7^1\times {\mathrm{149}}^1\times {\mathrm{257}}^1$

素因数の和:425

約数の個数: 40

約数和(自身を含む): 37461600

約数和(自身を除く): 15749469

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 149, 189, 257, 447, 567, 771, 1043, 1341, 1799, 2313, 3129, 4023, 5397, 6939, 9387, 12069, 16191, 20817, 28161, 38293, 48573, 84483, 114879, 145719, 268051, 344637, 804153, 1033911, 2412459, 3101733, 7237377, 21712131]

約数ペア:

[(1, 21712131), (3, 7237377), (7, 3101733), (9, 2412459), (21, 1033911), (27, 804153), (63, 344637), (81, 268051), (149, 145719), (189, 114879), (257, 84483), (447, 48573), (567, 38293), (771, 28161), (1043, 20817), (1341, 16191), (1799, 12069), (2313, 9387), (3129, 6939), (4023, 5397)]