21980420

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{2039}}^1$

素因数の和:2073

約数の個数: 72

約数和(自身を含む): 58605120

約数和(自身を除く): 36624700

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 49, 55, 70, 77, 98, 110, 140, 154, 196, 220, 245, 308, 385, 490, 539, 770, 980, 1078, 1540, 2039, 2156, 2695, 4078, 5390, 8156, 10195, 10780, 14273, 20390, 22429, 28546, 40780, 44858, 57092, 71365, 89716, 99911, 112145, 142730, 157003, 199822, 224290, 285460, 314006, 399644, 448580, 499555, 628012, 785015, 999110, 1099021, 1570030, 1998220, 2198042, 3140060, 4396084, 5495105, 10990210, 21980420]

約数ペア:

[(1, 21980420), (2, 10990210), (4, 5495105), (5, 4396084), (7, 3140060), (10, 2198042), (11, 1998220), (14, 1570030), (20, 1099021), (22, 999110), (28, 785015), (35, 628012), (44, 499555), (49, 448580), (55, 399644), (70, 314006), (77, 285460), (98, 224290), (110, 199822), (140, 157003), (154, 142730), (196, 112145), (220, 99911), (245, 89716), (308, 71365), (385, 57092), (490, 44858), (539, 40780), (770, 28546), (980, 22429), (1078, 20390), (1540, 14273), (2039, 10780), (2156, 10195), (2695, 8156), (4078, 5390)]