19778980

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{127}}^1\times {\mathrm{599}}^1$

素因数の和:748

約数の個数: 48

約数和(自身を含む): 45158400

約数和(自身を除く): 25379420

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 127, 130, 254, 260, 508, 599, 635, 1198, 1270, 1651, 2396, 2540, 2995, 3302, 5990, 6604, 7787, 8255, 11980, 15574, 16510, 31148, 33020, 38935, 76073, 77870, 152146, 155740, 304292, 380365, 760730, 988949, 1521460, 1977898, 3955796, 4944745, 9889490, 19778980]

約数ペア:

[(1, 19778980), (2, 9889490), (4, 4944745), (5, 3955796), (10, 1977898), (13, 1521460), (20, 988949), (26, 760730), (52, 380365), (65, 304292), (127, 155740), (130, 152146), (254, 77870), (260, 76073), (508, 38935), (599, 33020), (635, 31148), (1198, 16510), (1270, 15574), (1651, 11980), (2396, 8255), (2540, 7787), (2995, 6604), (3302, 5990)]