21123165

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{29}}^1\times {\mathrm{991}}^1$

素因数の和:1042

約数の個数: 48

約数和(自身を含む): 40711680

約数和(自身を除く): 19588515

約数列:

[1, 3, 5, 7, 15, 21, 29, 35, 49, 87, 105, 145, 147, 203, 245, 435, 609, 735, 991, 1015, 1421, 2973, 3045, 4263, 4955, 6937, 7105, 14865, 20811, 21315, 28739, 34685, 48559, 86217, 104055, 143695, 145677, 201173, 242795, 431085, 603519, 728385, 1005865, 1408211, 3017595, 4224633, 7041055, 21123165]

約数ペア:

[(1, 21123165), (3, 7041055), (5, 4224633), (7, 3017595), (15, 1408211), (21, 1005865), (29, 728385), (35, 603519), (49, 431085), (87, 242795), (105, 201173), (145, 145677), (147, 143695), (203, 104055), (245, 86217), (435, 48559), (609, 34685), (735, 28739), (991, 21315), (1015, 20811), (1421, 14865), (2973, 7105), (3045, 6937), (4263, 4955)]