21329240

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{103}}^1\times {\mathrm{167}}^1$

素因数の和:312

約数の個数: 64

約数和(自身を含む): 50319360

約数和(自身を除く): 28990120

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 103, 124, 155, 167, 206, 248, 310, 334, 412, 515, 620, 668, 824, 835, 1030, 1240, 1336, 1670, 2060, 3193, 3340, 4120, 5177, 6386, 6680, 10354, 12772, 15965, 17201, 20708, 25544, 25885, 31930, 34402, 41416, 51770, 63860, 68804, 86005, 103540, 127720, 137608, 172010, 207080, 344020, 533231, 688040, 1066462, 2132924, 2666155, 4265848, 5332310, 10664620, 21329240]

約数ペア:

[(1, 21329240), (2, 10664620), (4, 5332310), (5, 4265848), (8, 2666155), (10, 2132924), (20, 1066462), (31, 688040), (40, 533231), (62, 344020), (103, 207080), (124, 172010), (155, 137608), (167, 127720), (206, 103540), (248, 86005), (310, 68804), (334, 63860), (412, 51770), (515, 41416), (620, 34402), (668, 31930), (824, 25885), (835, 25544), (1030, 20708), (1240, 17201), (1336, 15965), (1670, 12772), (2060, 10354), (3193, 6680), (3340, 6386), (4120, 5177)]