21312520

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{12391}}^1$

素因数の和:12445

約数の個数: 32

約数和(自身を含む): 49072320

約数和(自身を除く): 27759800

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 12391, 24782, 49564, 61955, 99128, 123910, 247820, 495640, 532813, 1065626, 2131252, 2664065, 4262504, 5328130, 10656260, 21312520]

約数ペア:

[(1, 21312520), (2, 10656260), (4, 5328130), (5, 4262504), (8, 2664065), (10, 2131252), (20, 1065626), (40, 532813), (43, 495640), (86, 247820), (172, 123910), (215, 99128), (344, 61955), (430, 49564), (860, 24782), (1720, 12391)]