20419880

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{107}}^1\times {\mathrm{367}}^1$

素因数の和:498

約数の個数: 64

約数和(自身を含む): 50077440

約数和(自身を除く): 29657560

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 26, 40, 52, 65, 104, 107, 130, 214, 260, 367, 428, 520, 535, 734, 856, 1070, 1391, 1468, 1835, 2140, 2782, 2936, 3670, 4280, 4771, 5564, 6955, 7340, 9542, 11128, 13910, 14680, 19084, 23855, 27820, 38168, 39269, 47710, 55640, 78538, 95420, 157076, 190840, 196345, 314152, 392690, 510497, 785380, 1020994, 1570760, 2041988, 2552485, 4083976, 5104970, 10209940, 20419880]

約数ペア:

[(1, 20419880), (2, 10209940), (4, 5104970), (5, 4083976), (8, 2552485), (10, 2041988), (13, 1570760), (20, 1020994), (26, 785380), (40, 510497), (52, 392690), (65, 314152), (104, 196345), (107, 190840), (130, 157076), (214, 95420), (260, 78538), (367, 55640), (428, 47710), (520, 39269), (535, 38168), (734, 27820), (856, 23855), (1070, 19084), (1391, 14680), (1468, 13910), (1835, 11128), (2140, 9542), (2782, 7340), (2936, 6955), (3670, 5564), (4280, 4771)]