21905320

素因数分解:

$2^3\times 5^1\times {\mathrm{419}}^1\times {\mathrm{1307}}^1$

素因数の和:1737

約数の個数: 32

約数和(自身を含む): 49442400

約数和(自身を除く): 27537080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 419, 838, 1307, 1676, 2095, 2614, 3352, 4190, 5228, 6535, 8380, 10456, 13070, 16760, 26140, 52280, 547633, 1095266, 2190532, 2738165, 4381064, 5476330, 10952660, 21905320]

約数ペア:

[(1, 21905320), (2, 10952660), (4, 5476330), (5, 4381064), (8, 2738165), (10, 2190532), (20, 1095266), (40, 547633), (419, 52280), (838, 26140), (1307, 16760), (1676, 13070), (2095, 10456), (2614, 8380), (3352, 6535), (4190, 5228)]