21078428

素因数分解:

$2^2\times 7^2\times {\mathrm{41}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1$

素因数の和:163

約数の個数: 72

約数和(自身を含む): 45715824

約数和(自身を除く): 24637396

約数列:

[1, 2, 4, 7, 14, 28, 41, 43, 49, 61, 82, 86, 98, 122, 164, 172, 196, 244, 287, 301, 427, 574, 602, 854, 1148, 1204, 1708, 1763, 2009, 2107, 2501, 2623, 2989, 3526, 4018, 4214, 5002, 5246, 5978, 7052, 8036, 8428, 10004, 10492, 11956, 12341, 17507, 18361, 24682, 35014, 36722, 49364, 70028, 73444, 86387, 107543, 122549, 128527, 172774, 215086, 245098, 257054, 345548, 430172, 490196, 514108, 752801, 1505602, 3011204, 5269607, 10539214, 21078428]

約数ペア:

[(1, 21078428), (2, 10539214), (4, 5269607), (7, 3011204), (14, 1505602), (28, 752801), (41, 514108), (43, 490196), (49, 430172), (61, 345548), (82, 257054), (86, 245098), (98, 215086), (122, 172774), (164, 128527), (172, 122549), (196, 107543), (244, 86387), (287, 73444), (301, 70028), (427, 49364), (574, 36722), (602, 35014), (854, 24682), (1148, 18361), (1204, 17507), (1708, 12341), (1763, 11956), (2009, 10492), (2107, 10004), (2501, 8428), (2623, 8036), (2989, 7052), (3526, 5978), (4018, 5246), (4214, 5002)]