21511520

素因数分解:

$2^5\times 5^1\times {\mathrm{31}}^1\times {\mathrm{4337}}^1$

素因数の和:4383

約数の個数: 48

約数和(自身を含む): 52472448

約数和(自身を除く): 30960928

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 80, 124, 155, 160, 248, 310, 496, 620, 992, 1240, 2480, 4337, 4960, 8674, 17348, 21685, 34696, 43370, 69392, 86740, 134447, 138784, 173480, 268894, 346960, 537788, 672235, 693920, 1075576, 1344470, 2151152, 2688940, 4302304, 5377880, 10755760, 21511520]

約数ペア:

[(1, 21511520), (2, 10755760), (4, 5377880), (5, 4302304), (8, 2688940), (10, 2151152), (16, 1344470), (20, 1075576), (31, 693920), (32, 672235), (40, 537788), (62, 346960), (80, 268894), (124, 173480), (155, 138784), (160, 134447), (248, 86740), (310, 69392), (496, 43370), (620, 34696), (992, 21685), (1240, 17348), (2480, 8674), (4337, 4960)]