21012345

素因数分解:

$3^3\times 5^1\times {\mathrm{317}}^1\times {\mathrm{491}}^1$

素因数の和:822

約数の個数: 32

約数和(自身を含む): 37549440

約数和(自身を除く): 16537095

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 317, 491, 951, 1473, 1585, 2455, 2853, 4419, 4755, 7365, 8559, 13257, 14265, 22095, 42795, 66285, 155647, 466941, 778235, 1400823, 2334705, 4202469, 7004115, 21012345]

約数ペア:

[(1, 21012345), (3, 7004115), (5, 4202469), (9, 2334705), (15, 1400823), (27, 778235), (45, 466941), (135, 155647), (317, 66285), (491, 42795), (951, 22095), (1473, 14265), (1585, 13257), (2455, 8559), (2853, 7365), (4419, 4755)]