21209744

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{77977}}^1$

素因数の和:78002

約数の個数: 20

約数和(自身を含む): 43511724

約数和(自身を除く): 22301980

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 77977, 155954, 311908, 623816, 1247632, 1325609, 2651218, 5302436, 10604872, 21209744]

約数ペア:

[(1, 21209744), (2, 10604872), (4, 5302436), (8, 2651218), (16, 1325609), (17, 1247632), (34, 623816), (68, 311908), (136, 155954), (272, 77977)]