21119980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{937}}^1$

素因数の和:983

約数の個数: 72

約数和(自身を含む): 53893728

約数和(自身を除く): 32773748

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 23, 28, 35, 46, 49, 70, 92, 98, 115, 140, 161, 196, 230, 245, 322, 460, 490, 644, 805, 937, 980, 1127, 1610, 1874, 2254, 3220, 3748, 4508, 4685, 5635, 6559, 9370, 11270, 13118, 18740, 21551, 22540, 26236, 32795, 43102, 45913, 65590, 86204, 91826, 107755, 131180, 150857, 183652, 215510, 229565, 301714, 431020, 459130, 603428, 754285, 918260, 1055999, 1508570, 2111998, 3017140, 4223996, 5279995, 10559990, 21119980]

約数ペア:

[(1, 21119980), (2, 10559990), (4, 5279995), (5, 4223996), (7, 3017140), (10, 2111998), (14, 1508570), (20, 1055999), (23, 918260), (28, 754285), (35, 603428), (46, 459130), (49, 431020), (70, 301714), (92, 229565), (98, 215510), (115, 183652), (140, 150857), (161, 131180), (196, 107755), (230, 91826), (245, 86204), (322, 65590), (460, 45913), (490, 43102), (644, 32795), (805, 26236), (937, 22540), (980, 21551), (1127, 18740), (1610, 13118), (1874, 11270), (2254, 9370), (3220, 6559), (3748, 5635), (4508, 4685)]