21640215

素因数分解:

$3^1\times 5^1\times {\mathrm{97}}^1\times {\mathrm{107}}^1\times {\mathrm{139}}^1$

素因数の和:351

約数の個数: 32

約数和(自身を含む): 35562240

約数和(自身を除く): 13922025

約数列:

[1, 3, 5, 15, 97, 107, 139, 291, 321, 417, 485, 535, 695, 1455, 1605, 2085, 10379, 13483, 14873, 31137, 40449, 44619, 51895, 67415, 74365, 155685, 202245, 223095, 1442681, 4328043, 7213405, 21640215]

約数ペア:

[(1, 21640215), (3, 7213405), (5, 4328043), (15, 1442681), (97, 223095), (107, 202245), (139, 155685), (291, 74365), (321, 67415), (417, 51895), (485, 44619), (535, 40449), (695, 31137), (1455, 14873), (1605, 13483), (2085, 10379)]