21478340

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{82609}}^1$

素因数の和:82631

約数の個数: 24

約数和(自身を含む): 48574680

約数和(自身を除く): 27096340

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 82609, 165218, 330436, 413045, 826090, 1073917, 1652180, 2147834, 4295668, 5369585, 10739170, 21478340]

約数ペア:

[(1, 21478340), (2, 10739170), (4, 5369585), (5, 4295668), (10, 2147834), (13, 1652180), (20, 1073917), (26, 826090), (52, 413045), (65, 330436), (130, 165218), (260, 82609)]