21295480

素因数分解:

$2^3\times 5^1\times {\mathrm{157}}^1\times {\mathrm{3391}}^1$

素因数の和:3559

約数の個数: 32

約数和(自身を含む): 48234240

約数和(自身を除く): 26938760

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 157, 314, 628, 785, 1256, 1570, 3140, 3391, 6280, 6782, 13564, 16955, 27128, 33910, 67820, 135640, 532387, 1064774, 2129548, 2661935, 4259096, 5323870, 10647740, 21295480]

約数ペア:

[(1, 21295480), (2, 10647740), (4, 5323870), (5, 4259096), (8, 2661935), (10, 2129548), (20, 1064774), (40, 532387), (157, 135640), (314, 67820), (628, 33910), (785, 27128), (1256, 16955), (1570, 13564), (3140, 6782), (3391, 6280)]