21506260

素因数分解:

$2^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{137}}^1\times {\mathrm{167}}^1$

素因数の和:360

約数の個数: 48

約数和(自身を含む): 46738944

約数和(自身を除く): 25232684

約数列:

[1, 2, 4, 5, 10, 20, 47, 94, 137, 167, 188, 235, 274, 334, 470, 548, 668, 685, 835, 940, 1370, 1670, 2740, 3340, 6439, 7849, 12878, 15698, 22879, 25756, 31396, 32195, 39245, 45758, 64390, 78490, 91516, 114395, 128780, 156980, 228790, 457580, 1075313, 2150626, 4301252, 5376565, 10753130, 21506260]

約数ペア:

[(1, 21506260), (2, 10753130), (4, 5376565), (5, 4301252), (10, 2150626), (20, 1075313), (47, 457580), (94, 228790), (137, 156980), (167, 128780), (188, 114395), (235, 91516), (274, 78490), (334, 64390), (470, 45758), (548, 39245), (668, 32195), (685, 31396), (835, 25756), (940, 22879), (1370, 15698), (1670, 12878), (2740, 7849), (3340, 6439)]