21000840

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{1087}}^1$

素因数の和:1131

約数の個数: 128

約数和(自身を含む): 75202560

約数和(自身を除く): 54201720

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 23, 24, 28, 30, 35, 40, 42, 46, 56, 60, 69, 70, 84, 92, 105, 115, 120, 138, 140, 161, 168, 184, 210, 230, 276, 280, 322, 345, 420, 460, 483, 552, 644, 690, 805, 840, 920, 966, 1087, 1288, 1380, 1610, 1932, 2174, 2415, 2760, 3220, 3261, 3864, 4348, 4830, 5435, 6440, 6522, 7609, 8696, 9660, 10870, 13044, 15218, 16305, 19320, 21740, 22827, 25001, 26088, 30436, 32610, 38045, 43480, 45654, 50002, 60872, 65220, 75003, 76090, 91308, 100004, 114135, 125005, 130440, 150006, 152180, 175007, 182616, 200008, 228270, 250010, 300012, 304360, 350014, 375015, 456540, 500020, 525021, 600024, 700028, 750030, 875035, 913080, 1000040, 1050042, 1400056, 1500060, 1750070, 2100084, 2625105, 3000120, 3500140, 4200168, 5250210, 7000280, 10500420, 21000840]

約数ペア:

[(1, 21000840), (2, 10500420), (3, 7000280), (4, 5250210), (5, 4200168), (6, 3500140), (7, 3000120), (8, 2625105), (10, 2100084), (12, 1750070), (14, 1500060), (15, 1400056), (20, 1050042), (21, 1000040), (23, 913080), (24, 875035), (28, 750030), (30, 700028), (35, 600024), (40, 525021), (42, 500020), (46, 456540), (56, 375015), (60, 350014), (69, 304360), (70, 300012), (84, 250010), (92, 228270), (105, 200008), (115, 182616), (120, 175007), (138, 152180), (140, 150006), (161, 130440), (168, 125005), (184, 114135), (210, 100004), (230, 91308), (276, 76090), (280, 75003), (322, 65220), (345, 60872), (420, 50002), (460, 45654), (483, 43480), (552, 38045), (644, 32610), (690, 30436), (805, 26088), (840, 25001), (920, 22827), (966, 21740), (1087, 19320), (1288, 16305), (1380, 15218), (1610, 13044), (1932, 10870), (2174, 9660), (2415, 8696), (2760, 7609), (3220, 6522), (3261, 6440), (3864, 5435), (4348, 4830)]