21507278

素因数分解:

$2^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{197}}^1$

素因数の和:261

約数の個数: 48

約数和(自身を含む): 39132720

約数和(自身を除く): 17625442

約数列:

[1, 2, 13, 17, 19, 26, 34, 38, 169, 197, 221, 247, 323, 338, 394, 442, 494, 646, 2561, 2873, 3211, 3349, 3743, 4199, 5122, 5746, 6422, 6698, 7486, 8398, 33293, 43537, 48659, 54587, 63631, 66586, 87074, 97318, 109174, 127262, 565981, 632567, 827203, 1131962, 1265134, 1654406, 10753639, 21507278]

約数ペア:

[(1, 21507278), (2, 10753639), (13, 1654406), (17, 1265134), (19, 1131962), (26, 827203), (34, 632567), (38, 565981), (169, 127262), (197, 109174), (221, 97318), (247, 87074), (323, 66586), (338, 63631), (394, 54587), (442, 48659), (494, 43537), (646, 33293), (2561, 8398), (2873, 7486), (3211, 6698), (3349, 6422), (3743, 5746), (4199, 5122)]