21304940

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{101}}^1\times {\mathrm{199}}^1$

素因数の和:362

約数の個数: 48

約数和(自身を含む): 46267200

約数和(自身を除く): 24962260

約数列:

[1, 2, 4, 5, 10, 20, 53, 101, 106, 199, 202, 212, 265, 398, 404, 505, 530, 796, 995, 1010, 1060, 1990, 2020, 3980, 5353, 10547, 10706, 20099, 21094, 21412, 26765, 40198, 42188, 52735, 53530, 80396, 100495, 105470, 107060, 200990, 210940, 401980, 1065247, 2130494, 4260988, 5326235, 10652470, 21304940]

約数ペア:

[(1, 21304940), (2, 10652470), (4, 5326235), (5, 4260988), (10, 2130494), (20, 1065247), (53, 401980), (101, 210940), (106, 200990), (199, 107060), (202, 105470), (212, 100495), (265, 80396), (398, 53530), (404, 52735), (505, 42188), (530, 40198), (796, 26765), (995, 21412), (1010, 21094), (1060, 20099), (1990, 10706), (2020, 10547), (3980, 5353)]