21053925

素因数分解:

$3^4\times 5^2\times {\mathrm{37}}^1\times {\mathrm{281}}^1$

素因数の和:340

約数の個数: 60

約数和(自身を含む): 40195716

約数和(自身を除く): 19141791

約数列:

[1, 3, 5, 9, 15, 25, 27, 37, 45, 75, 81, 111, 135, 185, 225, 281, 333, 405, 555, 675, 843, 925, 999, 1405, 1665, 2025, 2529, 2775, 2997, 4215, 4995, 7025, 7587, 8325, 10397, 12645, 14985, 21075, 22761, 24975, 31191, 37935, 51985, 63225, 74925, 93573, 113805, 155955, 189675, 259925, 280719, 467865, 569025, 779775, 842157, 1403595, 2339325, 4210785, 7017975, 21053925]

約数ペア:

[(1, 21053925), (3, 7017975), (5, 4210785), (9, 2339325), (15, 1403595), (25, 842157), (27, 779775), (37, 569025), (45, 467865), (75, 280719), (81, 259925), (111, 189675), (135, 155955), (185, 113805), (225, 93573), (281, 74925), (333, 63225), (405, 51985), (555, 37935), (675, 31191), (843, 24975), (925, 22761), (999, 21075), (1405, 14985), (1665, 12645), (2025, 10397), (2529, 8325), (2775, 7587), (2997, 7025), (4215, 4995)]