21405965

素因数分解:

$5^1\times 7^1\times {\mathrm{31}}^1\times {\mathrm{109}}^1\times {\mathrm{181}}^1$

素因数の和:333

約数の個数: 32

約数和(自身を含む): 30750720

約数和(自身を除く): 9344755

約数列:

[1, 5, 7, 31, 35, 109, 155, 181, 217, 545, 763, 905, 1085, 1267, 3379, 3815, 5611, 6335, 16895, 19729, 23653, 28055, 39277, 98645, 118265, 138103, 196385, 611599, 690515, 3057995, 4281193, 21405965]

約数ペア:

[(1, 21405965), (5, 4281193), (7, 3057995), (31, 690515), (35, 611599), (109, 196385), (155, 138103), (181, 118265), (217, 98645), (545, 39277), (763, 28055), (905, 23653), (1085, 19729), (1267, 16895), (3379, 6335), (3815, 5611)]