21253185

素因数分解:

$3^4\times 5^1\times {\mathrm{97}}^1\times {\mathrm{541}}^1$

素因数の和:655

約数の個数: 40

約数和(自身を含む): 38562216

約数和(自身を除く): 17309031

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 97, 135, 291, 405, 485, 541, 873, 1455, 1623, 2619, 2705, 4365, 4869, 7857, 8115, 13095, 14607, 24345, 39285, 43821, 52477, 73035, 157431, 219105, 262385, 472293, 787155, 1416879, 2361465, 4250637, 7084395, 21253185]

約数ペア:

[(1, 21253185), (3, 7084395), (5, 4250637), (9, 2361465), (15, 1416879), (27, 787155), (45, 472293), (81, 262385), (97, 219105), (135, 157431), (291, 73035), (405, 52477), (485, 43821), (541, 39285), (873, 24345), (1455, 14607), (1623, 13095), (2619, 8115), (2705, 7857), (4365, 4869)]