20721051

素因数分解:

$3^2\times {\mathrm{13}}^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{197}}^1$

素因数の和:276

約数の個数: 48

約数和(自身を含む): 34594560

約数和(自身を除く): 13873509

約数列:

[1, 3, 9, 13, 29, 31, 39, 87, 93, 117, 197, 261, 279, 377, 403, 591, 899, 1131, 1209, 1773, 2561, 2697, 3393, 3627, 5713, 6107, 7683, 8091, 11687, 17139, 18321, 23049, 35061, 51417, 54963, 74269, 79391, 105183, 177103, 222807, 238173, 531309, 668421, 714519, 1593927, 2302339, 6907017, 20721051]

約数ペア:

[(1, 20721051), (3, 6907017), (9, 2302339), (13, 1593927), (29, 714519), (31, 668421), (39, 531309), (87, 238173), (93, 222807), (117, 177103), (197, 105183), (261, 79391), (279, 74269), (377, 54963), (403, 51417), (591, 35061), (899, 23049), (1131, 18321), (1209, 17139), (1773, 11687), (2561, 8091), (2697, 7683), (3393, 6107), (3627, 5713)]