21186459

素因数分解:

$3^2\times 7^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1\times {\mathrm{149}}^1$

素因数の和:260

約数の個数: 48

約数和(自身を含む): 36753600

約数和(自身を除く): 15567141

約数列:

[1, 3, 7, 9, 21, 37, 61, 63, 111, 149, 183, 259, 333, 427, 447, 549, 777, 1043, 1281, 1341, 2257, 2331, 3129, 3843, 5513, 6771, 9089, 9387, 15799, 16539, 20313, 27267, 38591, 47397, 49617, 63623, 81801, 115773, 142191, 190869, 336293, 347319, 572607, 1008879, 2354051, 3026637, 7062153, 21186459]

約数ペア:

[(1, 21186459), (3, 7062153), (7, 3026637), (9, 2354051), (21, 1008879), (37, 572607), (61, 347319), (63, 336293), (111, 190869), (149, 142191), (183, 115773), (259, 81801), (333, 63623), (427, 49617), (447, 47397), (549, 38591), (777, 27267), (1043, 20313), (1281, 16539), (1341, 15799), (2257, 9387), (2331, 9089), (3129, 6771), (3843, 5513)]