21505743

素因数分解:

$3^5\times 7^1\times {\mathrm{47}}^1\times {\mathrm{269}}^1$

素因数の和:338

約数の個数: 48

約数和(自身を含む): 37739520

約数和(自身を除く): 16233777

約数列:

[1, 3, 7, 9, 21, 27, 47, 63, 81, 141, 189, 243, 269, 329, 423, 567, 807, 987, 1269, 1701, 1883, 2421, 2961, 3807, 5649, 7263, 8883, 11421, 12643, 16947, 21789, 26649, 37929, 50841, 65367, 79947, 88501, 113787, 152523, 265503, 341361, 457569, 796509, 1024083, 2389527, 3072249, 7168581, 21505743]

約数ペア:

[(1, 21505743), (3, 7168581), (7, 3072249), (9, 2389527), (21, 1024083), (27, 796509), (47, 457569), (63, 341361), (81, 265503), (141, 152523), (189, 113787), (243, 88501), (269, 79947), (329, 65367), (423, 50841), (567, 37929), (807, 26649), (987, 21789), (1269, 16947), (1701, 12643), (1883, 11421), (2421, 8883), (2961, 7263), (3807, 5649)]