21279570

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{54563}}^1$

素因数の和:54586

約数の個数: 32

約数和(自身を含む): 55000512

約数和(自身を除く): 33720942

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390, 54563, 109126, 163689, 272815, 327378, 545630, 709319, 818445, 1418638, 1636890, 2127957, 3546595, 4255914, 7093190, 10639785, 21279570]

約数ペア:

[(1, 21279570), (2, 10639785), (3, 7093190), (5, 4255914), (6, 3546595), (10, 2127957), (13, 1636890), (15, 1418638), (26, 818445), (30, 709319), (39, 545630), (65, 327378), (78, 272815), (130, 163689), (195, 109126), (390, 54563)]