20180680

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{197}}^2$

素因数の和:418

約数の個数: 48

約数和(自身を含む): 49148820

約数和(自身を除く): 28968140

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 130, 197, 260, 394, 520, 788, 985, 1576, 1970, 2561, 3940, 5122, 7880, 10244, 12805, 20488, 25610, 38809, 51220, 77618, 102440, 155236, 194045, 310472, 388090, 504517, 776180, 1009034, 1552360, 2018068, 2522585, 4036136, 5045170, 10090340, 20180680]

約数ペア:

[(1, 20180680), (2, 10090340), (4, 5045170), (5, 4036136), (8, 2522585), (10, 2018068), (13, 1552360), (20, 1009034), (26, 776180), (40, 504517), (52, 388090), (65, 310472), (104, 194045), (130, 155236), (197, 102440), (260, 77618), (394, 51220), (520, 38809), (788, 25610), (985, 20488), (1576, 12805), (1970, 10244), (2561, 7880), (3940, 5122)]