28403905

素因数分解:

$5^1\times {\mathrm{29}}^1\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{89}}^1$

素因数の和:225

約数の個数: 32

約数和(自身を含む): 37324800

約数和(自身を除く): 8920895

約数列:

[1, 5, 29, 31, 71, 89, 145, 155, 355, 445, 899, 2059, 2201, 2581, 2759, 4495, 6319, 10295, 11005, 12905, 13795, 31595, 63829, 80011, 183251, 195889, 319145, 400055, 916255, 979445, 5680781, 28403905]

約数ペア:

[(1, 28403905), (5, 5680781), (29, 979445), (31, 916255), (71, 400055), (89, 319145), (145, 195889), (155, 183251), (355, 80011), (445, 63829), (899, 31595), (2059, 13795), (2201, 12905), (2581, 11005), (2759, 10295), (4495, 6319)]