21287745

素因数分解:

$3^3\times 5^1\times {\mathrm{137}}^1\times {\mathrm{1151}}^1$

素因数の和:1302

約数の個数: 32

約数和(自身を含む): 38154240

約数和(自身を除く): 16866495

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 137, 411, 685, 1151, 1233, 2055, 3453, 3699, 5755, 6165, 10359, 17265, 18495, 31077, 51795, 155385, 157687, 473061, 788435, 1419183, 2365305, 4257549, 7095915, 21287745]

約数ペア:

[(1, 21287745), (3, 7095915), (5, 4257549), (9, 2365305), (15, 1419183), (27, 788435), (45, 473061), (135, 157687), (137, 155385), (411, 51795), (685, 31077), (1151, 18495), (1233, 17265), (2055, 10359), (3453, 6165), (3699, 5755)]