21040890

素因数分解:

$2^1\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53951}}^1$

素因数の和:53974

約数の個数: 32

約数和(自身を含む): 54383616

約数和(自身を除く): 33342726

約数列:

[1, 2, 3, 5, 6, 10, 13, 15, 26, 30, 39, 65, 78, 130, 195, 390, 53951, 107902, 161853, 269755, 323706, 539510, 701363, 809265, 1402726, 1618530, 2104089, 3506815, 4208178, 7013630, 10520445, 21040890]

約数ペア:

[(1, 21040890), (2, 10520445), (3, 7013630), (5, 4208178), (6, 3506815), (10, 2104089), (13, 1618530), (15, 1402726), (26, 809265), (30, 701363), (39, 539510), (65, 323706), (78, 269755), (130, 161853), (195, 107902), (390, 53951)]