20640968

素因数分解:

$2^3\times {\mathrm{37}}^1\times {\mathrm{137}}^1\times {\mathrm{509}}^1$

素因数の和:689

約数の個数: 32

約数和(自身を含む): 40116600

約数和(自身を除く): 19475632

約数列:

[1, 2, 4, 8, 37, 74, 137, 148, 274, 296, 509, 548, 1018, 1096, 2036, 4072, 5069, 10138, 18833, 20276, 37666, 40552, 69733, 75332, 139466, 150664, 278932, 557864, 2580121, 5160242, 10320484, 20640968]

約数ペア:

[(1, 20640968), (2, 10320484), (4, 5160242), (8, 2580121), (37, 557864), (74, 278932), (137, 150664), (148, 139466), (274, 75332), (296, 69733), (509, 40552), (548, 37666), (1018, 20276), (1096, 18833), (2036, 10138), (4072, 5069)]