21291640

素因数分解:

$2^3\times 5^1\times {\mathrm{487}}^1\times {\mathrm{1093}}^1$

素因数の和:1591

約数の個数: 32

約数和(自身を含む): 48048480

約数和(自身を除く): 26756840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 487, 974, 1093, 1948, 2186, 2435, 3896, 4372, 4870, 5465, 8744, 9740, 10930, 19480, 21860, 43720, 532291, 1064582, 2129164, 2661455, 4258328, 5322910, 10645820, 21291640]

約数ペア:

[(1, 21291640), (2, 10645820), (4, 5322910), (5, 4258328), (8, 2661455), (10, 2129164), (20, 1064582), (40, 532291), (487, 43720), (974, 21860), (1093, 19480), (1948, 10930), (2186, 9740), (2435, 8744), (3896, 5465), (4372, 4870)]