21939775

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{19}}^2$

素因数の和:89

約数の個数: 72

約数和(自身を含む): 35716464

約数和(自身を除く): 13776689

約数列:

[1, 5, 11, 13, 17, 19, 25, 55, 65, 85, 95, 143, 187, 209, 221, 247, 275, 323, 325, 361, 425, 475, 715, 935, 1045, 1105, 1235, 1615, 1805, 2431, 2717, 3553, 3575, 3971, 4199, 4675, 4693, 5225, 5525, 6137, 6175, 8075, 9025, 12155, 13585, 17765, 19855, 20995, 23465, 30685, 46189, 51623, 60775, 67507, 67925, 79781, 88825, 99275, 104975, 117325, 153425, 230945, 258115, 337535, 398905, 877591, 1154725, 1290575, 1687675, 1994525, 4387955, 21939775]

約数ペア:

[(1, 21939775), (5, 4387955), (11, 1994525), (13, 1687675), (17, 1290575), (19, 1154725), (25, 877591), (55, 398905), (65, 337535), (85, 258115), (95, 230945), (143, 153425), (187, 117325), (209, 104975), (221, 99275), (247, 88825), (275, 79781), (323, 67925), (325, 67507), (361, 60775), (425, 51623), (475, 46189), (715, 30685), (935, 23465), (1045, 20995), (1105, 19855), (1235, 17765), (1615, 13585), (1805, 12155), (2431, 9025), (2717, 8075), (3553, 6175), (3575, 6137), (3971, 5525), (4199, 5225), (4675, 4693)]