21511820

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{277}}^1\times {\mathrm{353}}^1$

素因数の和:650

約数の個数: 48

約数和(自身を含む): 49599648

約数和(自身を除く): 28087828

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 220, 277, 353, 554, 706, 1108, 1385, 1412, 1765, 2770, 3047, 3530, 3883, 5540, 6094, 7060, 7766, 12188, 15235, 15532, 19415, 30470, 38830, 60940, 77660, 97781, 195562, 391124, 488905, 977810, 1075591, 1955620, 2151182, 4302364, 5377955, 10755910, 21511820]

約数ペア:

[(1, 21511820), (2, 10755910), (4, 5377955), (5, 4302364), (10, 2151182), (11, 1955620), (20, 1075591), (22, 977810), (44, 488905), (55, 391124), (110, 195562), (220, 97781), (277, 77660), (353, 60940), (554, 38830), (706, 30470), (1108, 19415), (1385, 15532), (1412, 15235), (1765, 12188), (2770, 7766), (3047, 7060), (3530, 6094), (3883, 5540)]