19971028

素因数分解:

$2^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{59}}^1\times {\mathrm{157}}^1$

素因数の和:245

約数の個数: 72

約数和(自身を含む): 45390240

約数和(自身を除く): 25419212

約数列:

[1, 2, 4, 7, 11, 14, 22, 28, 44, 49, 59, 77, 98, 118, 154, 157, 196, 236, 308, 314, 413, 539, 628, 649, 826, 1078, 1099, 1298, 1652, 1727, 2156, 2198, 2596, 2891, 3454, 4396, 4543, 5782, 6908, 7693, 9086, 9263, 11564, 12089, 15386, 18172, 18526, 24178, 30772, 31801, 37052, 48356, 63602, 64841, 84623, 101893, 127204, 129682, 169246, 203786, 259364, 338492, 407572, 453887, 713251, 907774, 1426502, 1815548, 2853004, 4992757, 9985514, 19971028]

約数ペア:

[(1, 19971028), (2, 9985514), (4, 4992757), (7, 2853004), (11, 1815548), (14, 1426502), (22, 907774), (28, 713251), (44, 453887), (49, 407572), (59, 338492), (77, 259364), (98, 203786), (118, 169246), (154, 129682), (157, 127204), (196, 101893), (236, 84623), (308, 64841), (314, 63602), (413, 48356), (539, 37052), (628, 31801), (649, 30772), (826, 24178), (1078, 18526), (1099, 18172), (1298, 15386), (1652, 12089), (1727, 11564), (2156, 9263), (2198, 9086), (2596, 7693), (2891, 6908), (3454, 5782), (4396, 4543)]