20993985

素因数分解:

$3^5\times 5^1\times {\mathrm{37}}^1\times {\mathrm{467}}^1$

素因数の和:524

約数の個数: 48

約数和(自身を含む): 38840256

約数和(自身を除く): 17846271

約数列:

[1, 3, 5, 9, 15, 27, 37, 45, 81, 111, 135, 185, 243, 333, 405, 467, 555, 999, 1215, 1401, 1665, 2335, 2997, 4203, 4995, 7005, 8991, 12609, 14985, 17279, 21015, 37827, 44955, 51837, 63045, 86395, 113481, 155511, 189135, 259185, 466533, 567405, 777555, 1399599, 2332665, 4198797, 6997995, 20993985]

約数ペア:

[(1, 20993985), (3, 6997995), (5, 4198797), (9, 2332665), (15, 1399599), (27, 777555), (37, 567405), (45, 466533), (81, 259185), (111, 189135), (135, 155511), (185, 113481), (243, 86395), (333, 63045), (405, 51837), (467, 44955), (555, 37827), (999, 21015), (1215, 17279), (1401, 14985), (1665, 12609), (2335, 8991), (2997, 7005), (4203, 4995)]