20687212

素因数分解:

$2^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{353}}^1$

素因数の和:407

約数の個数: 72

約数和(自身を含む): 47458656

約数和(自身を除く): 26771444

約数列:

[1, 2, 4, 7, 13, 14, 23, 26, 28, 46, 49, 52, 91, 92, 98, 161, 182, 196, 299, 322, 353, 364, 598, 637, 644, 706, 1127, 1196, 1274, 1412, 2093, 2254, 2471, 2548, 4186, 4508, 4589, 4942, 8119, 8372, 9178, 9884, 14651, 16238, 17297, 18356, 29302, 32123, 32476, 34594, 56833, 58604, 64246, 69188, 105547, 113666, 128492, 211094, 224861, 227332, 397831, 422188, 449722, 738829, 795662, 899444, 1477658, 1591324, 2955316, 5171803, 10343606, 20687212]

約数ペア:

[(1, 20687212), (2, 10343606), (4, 5171803), (7, 2955316), (13, 1591324), (14, 1477658), (23, 899444), (26, 795662), (28, 738829), (46, 449722), (49, 422188), (52, 397831), (91, 227332), (92, 224861), (98, 211094), (161, 128492), (182, 113666), (196, 105547), (299, 69188), (322, 64246), (353, 58604), (364, 56833), (598, 34594), (637, 32476), (644, 32123), (706, 29302), (1127, 18356), (1196, 17297), (1274, 16238), (1412, 14651), (2093, 9884), (2254, 9178), (2471, 8372), (2548, 8119), (4186, 4942), (4508, 4589)]