21130720

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{10159}}^1$

素因数の和:10187

約数の個数: 48

約数和(自身を含む): 53766720

約数和(自身を除く): 32636000

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 208, 260, 416, 520, 1040, 2080, 10159, 20318, 40636, 50795, 81272, 101590, 132067, 162544, 203180, 264134, 325088, 406360, 528268, 660335, 812720, 1056536, 1320670, 1625440, 2113072, 2641340, 4226144, 5282680, 10565360, 21130720]

約数ペア:

[(1, 21130720), (2, 10565360), (4, 5282680), (5, 4226144), (8, 2641340), (10, 2113072), (13, 1625440), (16, 1320670), (20, 1056536), (26, 812720), (32, 660335), (40, 528268), (52, 406360), (65, 325088), (80, 264134), (104, 203180), (130, 162544), (160, 132067), (208, 101590), (260, 81272), (416, 50795), (520, 40636), (1040, 20318), (2080, 10159)]