21551720

素因数分解:

$2^3\times 5^1\times {\mathrm{103}}^1\times {\mathrm{5231}}^1$

素因数の和:5345

約数の個数: 32

約数和(自身を含む): 48971520

約数和(自身を除く): 27419800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 103, 206, 412, 515, 824, 1030, 2060, 4120, 5231, 10462, 20924, 26155, 41848, 52310, 104620, 209240, 538793, 1077586, 2155172, 2693965, 4310344, 5387930, 10775860, 21551720]

約数ペア:

[(1, 21551720), (2, 10775860), (4, 5387930), (5, 4310344), (8, 2693965), (10, 2155172), (20, 1077586), (40, 538793), (103, 209240), (206, 104620), (412, 52310), (515, 41848), (824, 26155), (1030, 20924), (2060, 10462), (4120, 5231)]