21208840

素因数分解:

$2^3\times 5^1\times {\mathrm{379}}^1\times {\mathrm{1399}}^1$

素因数の和:1789

約数の個数: 32

約数和(自身を含む): 47880000

約数和(自身を除く): 26671160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 379, 758, 1399, 1516, 1895, 2798, 3032, 3790, 5596, 6995, 7580, 11192, 13990, 15160, 27980, 55960, 530221, 1060442, 2120884, 2651105, 4241768, 5302210, 10604420, 21208840]

約数ペア:

[(1, 21208840), (2, 10604420), (4, 5302210), (5, 4241768), (8, 2651105), (10, 2120884), (20, 1060442), (40, 530221), (379, 55960), (758, 27980), (1399, 15160), (1516, 13990), (1895, 11192), (2798, 7580), (3032, 6995), (3790, 5596)]