21538881

素因数分解:

$3^2\times 7^2\times {\mathrm{13}}^2\times {\mathrm{17}}^2$

素因数の和:80

約数の個数: 81

約数和(自身を含む): 41630121

約数和(自身を除く): 20091240

約数列:

[1, 3, 7, 9, 13, 17, 21, 39, 49, 51, 63, 91, 117, 119, 147, 153, 169, 221, 273, 289, 357, 441, 507, 637, 663, 819, 833, 867, 1071, 1183, 1521, 1547, 1911, 1989, 2023, 2499, 2601, 2873, 3549, 3757, 4641, 5733, 6069, 7497, 8281, 8619, 10647, 10829, 11271, 13923, 14161, 18207, 20111, 24843, 25857, 26299, 32487, 33813, 42483, 48841, 60333, 74529, 78897, 97461, 127449, 140777, 146523, 180999, 184093, 236691, 341887, 422331, 439569, 552279, 1025661, 1266993, 1656837, 2393209, 3076983, 7179627, 21538881]

約数ペア:

[(1, 21538881), (3, 7179627), (7, 3076983), (9, 2393209), (13, 1656837), (17, 1266993), (21, 1025661), (39, 552279), (49, 439569), (51, 422331), (63, 341887), (91, 236691), (117, 184093), (119, 180999), (147, 146523), (153, 140777), (169, 127449), (221, 97461), (273, 78897), (289, 74529), (357, 60333), (441, 48841), (507, 42483), (637, 33813), (663, 32487), (819, 26299), (833, 25857), (867, 24843), (1071, 20111), (1183, 18207), (1521, 14161), (1547, 13923), (1911, 11271), (1989, 10829), (2023, 10647), (2499, 8619), (2601, 8281), (2873, 7497), (3549, 6069), (3757, 5733)]