21713320

素因数分解:

$2^3\times 5^1\times {\mathrm{647}}^1\times {\mathrm{839}}^1$

素因数の和:1497

約数の個数: 32

約数和(自身を含む): 48988800

約数和(自身を除く): 27275480

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 647, 839, 1294, 1678, 2588, 3235, 3356, 4195, 5176, 6470, 6712, 8390, 12940, 16780, 25880, 33560, 542833, 1085666, 2171332, 2714165, 4342664, 5428330, 10856660, 21713320]

約数ペア:

[(1, 21713320), (2, 10856660), (4, 5428330), (5, 4342664), (8, 2714165), (10, 2171332), (20, 1085666), (40, 542833), (647, 33560), (839, 25880), (1294, 16780), (1678, 12940), (2588, 8390), (3235, 6712), (3356, 6470), (4195, 5176)]