21660080

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{59}}^1\times {\mathrm{353}}^1$

素因数の和:438

約数の個数: 80

約数和(自身を含む): 55308960

約数和(自身を除く): 33648880

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 59, 65, 80, 104, 118, 130, 208, 236, 260, 295, 353, 472, 520, 590, 706, 767, 944, 1040, 1180, 1412, 1534, 1765, 2360, 2824, 3068, 3530, 3835, 4589, 4720, 5648, 6136, 7060, 7670, 9178, 12272, 14120, 15340, 18356, 20827, 22945, 28240, 30680, 36712, 41654, 45890, 61360, 73424, 83308, 91780, 104135, 166616, 183560, 208270, 270751, 333232, 367120, 416540, 541502, 833080, 1083004, 1353755, 1666160, 2166008, 2707510, 4332016, 5415020, 10830040, 21660080]

約数ペア:

[(1, 21660080), (2, 10830040), (4, 5415020), (5, 4332016), (8, 2707510), (10, 2166008), (13, 1666160), (16, 1353755), (20, 1083004), (26, 833080), (40, 541502), (52, 416540), (59, 367120), (65, 333232), (80, 270751), (104, 208270), (118, 183560), (130, 166616), (208, 104135), (236, 91780), (260, 83308), (295, 73424), (353, 61360), (472, 45890), (520, 41654), (590, 36712), (706, 30680), (767, 28240), (944, 22945), (1040, 20827), (1180, 18356), (1412, 15340), (1534, 14120), (1765, 12272), (2360, 9178), (2824, 7670), (3068, 7060), (3530, 6136), (3835, 5648), (4589, 4720)]