19987605

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{149}}^1\times {\mathrm{271}}^1$

素因数の和:442

約数の個数: 48

約数和(自身を含む): 38188800

約数和(自身を除く): 18201195

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 55, 99, 149, 165, 271, 447, 495, 745, 813, 1341, 1355, 1639, 2235, 2439, 2981, 4065, 4917, 6705, 8195, 8943, 12195, 14751, 14905, 24585, 26829, 40379, 44715, 73755, 121137, 134145, 201895, 363411, 444169, 605685, 1332507, 1817055, 2220845, 3997521, 6662535, 19987605]

約数ペア:

[(1, 19987605), (3, 6662535), (5, 3997521), (9, 2220845), (11, 1817055), (15, 1332507), (33, 605685), (45, 444169), (55, 363411), (99, 201895), (149, 134145), (165, 121137), (271, 73755), (447, 44715), (495, 40379), (745, 26829), (813, 24585), (1341, 14905), (1355, 14751), (1639, 12195), (2235, 8943), (2439, 8195), (2981, 6705), (4065, 4917)]