21047440

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{227}}^1$

素因数の和:320

約数の個数: 80

約数和(自身を含む): 52585920

約数和(自身を除く): 31538480

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 61, 76, 80, 95, 122, 152, 190, 227, 244, 304, 305, 380, 454, 488, 610, 760, 908, 976, 1135, 1159, 1220, 1520, 1816, 2270, 2318, 2440, 3632, 4313, 4540, 4636, 4880, 5795, 8626, 9080, 9272, 11590, 13847, 17252, 18160, 18544, 21565, 23180, 27694, 34504, 43130, 46360, 55388, 69008, 69235, 86260, 92720, 110776, 138470, 172520, 221552, 263093, 276940, 345040, 526186, 553880, 1052372, 1107760, 1315465, 2104744, 2630930, 4209488, 5261860, 10523720, 21047440]

約数ペア:

[(1, 21047440), (2, 10523720), (4, 5261860), (5, 4209488), (8, 2630930), (10, 2104744), (16, 1315465), (19, 1107760), (20, 1052372), (38, 553880), (40, 526186), (61, 345040), (76, 276940), (80, 263093), (95, 221552), (122, 172520), (152, 138470), (190, 110776), (227, 92720), (244, 86260), (304, 69235), (305, 69008), (380, 55388), (454, 46360), (488, 43130), (610, 34504), (760, 27694), (908, 23180), (976, 21565), (1135, 18544), (1159, 18160), (1220, 17252), (1520, 13847), (1816, 11590), (2270, 9272), (2318, 9080), (2440, 8626), (3632, 5795), (4313, 4880), (4540, 4636)]