21287344

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1931}}^1$

素因数の和:2005

約数の個数: 40

約数和(自身を含む): 45278352

約数和(自身を除く): 23991008

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 53, 104, 106, 208, 212, 424, 689, 848, 1378, 1931, 2756, 3862, 5512, 7724, 11024, 15448, 25103, 30896, 50206, 100412, 102343, 200824, 204686, 401648, 409372, 818744, 1330459, 1637488, 2660918, 5321836, 10643672, 21287344]

約数ペア:

[(1, 21287344), (2, 10643672), (4, 5321836), (8, 2660918), (13, 1637488), (16, 1330459), (26, 818744), (52, 409372), (53, 401648), (104, 204686), (106, 200824), (208, 102343), (212, 100412), (424, 50206), (689, 30896), (848, 25103), (1378, 15448), (1931, 11024), (2756, 7724), (3862, 5512)]