21912813

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{479}}^1$

素因数の和:538

約数の個数: 48

約数和(自身を含む): 37739520

約数和(自身を除く): 15826707

約数列:

[1, 3, 9, 13, 17, 23, 39, 51, 69, 117, 153, 207, 221, 299, 391, 479, 663, 897, 1173, 1437, 1989, 2691, 3519, 4311, 5083, 6227, 8143, 11017, 15249, 18681, 24429, 33051, 45747, 56043, 73287, 99153, 105859, 143221, 187289, 317577, 429663, 561867, 952731, 1288989, 1685601, 2434757, 7304271, 21912813]

約数ペア:

[(1, 21912813), (3, 7304271), (9, 2434757), (13, 1685601), (17, 1288989), (23, 952731), (39, 561867), (51, 429663), (69, 317577), (117, 187289), (153, 143221), (207, 105859), (221, 99153), (299, 73287), (391, 56043), (479, 45747), (663, 33051), (897, 24429), (1173, 18681), (1437, 15249), (1989, 11017), (2691, 8143), (3519, 6227), (4311, 5083)]