18207620

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{89}}^1\times {\mathrm{193}}^1$

素因数の和:344

約数の個数: 48

約数和(自身を含む): 39599280

約数和(自身を除く): 21391660

約数列:

[1, 2, 4, 5, 10, 20, 53, 89, 106, 178, 193, 212, 265, 356, 386, 445, 530, 772, 890, 965, 1060, 1780, 1930, 3860, 4717, 9434, 10229, 17177, 18868, 20458, 23585, 34354, 40916, 47170, 51145, 68708, 85885, 94340, 102290, 171770, 204580, 343540, 910381, 1820762, 3641524, 4551905, 9103810, 18207620]

約数ペア:

[(1, 18207620), (2, 9103810), (4, 4551905), (5, 3641524), (10, 1820762), (20, 910381), (53, 343540), (89, 204580), (106, 171770), (178, 102290), (193, 94340), (212, 85885), (265, 68708), (356, 51145), (386, 47170), (445, 40916), (530, 34354), (772, 23585), (890, 20458), (965, 18868), (1060, 17177), (1780, 10229), (1930, 9434), (3860, 4717)]