21287536

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{61}}^1\times {\mathrm{1283}}^1$

素因数の和:1369

約数の個数: 40

約数和(自身を含む): 44421264

約数和(自身を除く): 23133728

約数列:

[1, 2, 4, 8, 16, 17, 34, 61, 68, 122, 136, 244, 272, 488, 976, 1037, 1283, 2074, 2566, 4148, 5132, 8296, 10264, 16592, 20528, 21811, 43622, 78263, 87244, 156526, 174488, 313052, 348976, 626104, 1252208, 1330471, 2660942, 5321884, 10643768, 21287536]

約数ペア:

[(1, 21287536), (2, 10643768), (4, 5321884), (8, 2660942), (16, 1330471), (17, 1252208), (34, 626104), (61, 348976), (68, 313052), (122, 174488), (136, 156526), (244, 87244), (272, 78263), (488, 43622), (976, 21811), (1037, 20528), (1283, 16592), (2074, 10264), (2566, 8296), (4148, 5132)]