21479985

素因数分解:

$3^6\times 5^1\times {\mathrm{71}}^1\times {\mathrm{83}}^1$

素因数の和:177

約数の個数: 56

約数和(自身を含む): 39662784

約数和(自身を除く): 18182799

約数列:

[1, 3, 5, 9, 15, 27, 45, 71, 81, 83, 135, 213, 243, 249, 355, 405, 415, 639, 729, 747, 1065, 1215, 1245, 1917, 2241, 3195, 3645, 3735, 5751, 5893, 6723, 9585, 11205, 17253, 17679, 20169, 28755, 29465, 33615, 51759, 53037, 60507, 86265, 88395, 100845, 159111, 258795, 265185, 302535, 477333, 795555, 1431999, 2386665, 4295997, 7159995, 21479985]

約数ペア:

[(1, 21479985), (3, 7159995), (5, 4295997), (9, 2386665), (15, 1431999), (27, 795555), (45, 477333), (71, 302535), (81, 265185), (83, 258795), (135, 159111), (213, 100845), (243, 88395), (249, 86265), (355, 60507), (405, 53037), (415, 51759), (639, 33615), (729, 29465), (747, 28755), (1065, 20169), (1215, 17679), (1245, 17253), (1917, 11205), (2241, 9585), (3195, 6723), (3645, 5893), (3735, 5751)]