21087568

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{977}}^1$

素因数の和:1075

約数の個数: 40

約数和(自身を含む): 43657920

約数和(自身を除く): 22570352

約数列:

[1, 2, 4, 8, 16, 19, 38, 71, 76, 142, 152, 284, 304, 568, 977, 1136, 1349, 1954, 2698, 3908, 5396, 7816, 10792, 15632, 18563, 21584, 37126, 69367, 74252, 138734, 148504, 277468, 297008, 554936, 1109872, 1317973, 2635946, 5271892, 10543784, 21087568]

約数ペア:

[(1, 21087568), (2, 10543784), (4, 5271892), (8, 2635946), (16, 1317973), (19, 1109872), (38, 554936), (71, 297008), (76, 277468), (142, 148504), (152, 138734), (284, 74252), (304, 69367), (568, 37126), (977, 21584), (1136, 18563), (1349, 15632), (1954, 10792), (2698, 7816), (3908, 5396)]