21217904

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{78007}}^1$

素因数の和:78032

約数の個数: 20

約数和(自身を含む): 43528464

約数和(自身を除く): 22310560

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 78007, 156014, 312028, 624056, 1248112, 1326119, 2652238, 5304476, 10608952, 21217904]

約数ペア:

[(1, 21217904), (2, 10608952), (4, 5304476), (8, 2652238), (16, 1326119), (17, 1248112), (34, 624056), (68, 312028), (136, 156014), (272, 78007)]