21651640

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{919}}^1$

素因数の和:980

約数の個数: 64

約数和(自身を含む): 52992000

約数和(自身を除く): 31340360

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 31, 38, 40, 62, 76, 95, 124, 152, 155, 190, 248, 310, 380, 589, 620, 760, 919, 1178, 1240, 1838, 2356, 2945, 3676, 4595, 4712, 5890, 7352, 9190, 11780, 17461, 18380, 23560, 28489, 34922, 36760, 56978, 69844, 87305, 113956, 139688, 142445, 174610, 227912, 284890, 349220, 541291, 569780, 698440, 1082582, 1139560, 2165164, 2706455, 4330328, 5412910, 10825820, 21651640]

約数ペア:

[(1, 21651640), (2, 10825820), (4, 5412910), (5, 4330328), (8, 2706455), (10, 2165164), (19, 1139560), (20, 1082582), (31, 698440), (38, 569780), (40, 541291), (62, 349220), (76, 284890), (95, 227912), (124, 174610), (152, 142445), (155, 139688), (190, 113956), (248, 87305), (310, 69844), (380, 56978), (589, 36760), (620, 34922), (760, 28489), (919, 23560), (1178, 18380), (1240, 17461), (1838, 11780), (2356, 9190), (2945, 7352), (3676, 5890), (4595, 4712)]