20781565

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{659}}^1$

素因数の和:741

約数の個数: 32

約数和(自身を含む): 30792960

約数和(自身を除く): 10011395

約数列:

[1, 5, 7, 17, 35, 53, 85, 119, 265, 371, 595, 659, 901, 1855, 3295, 4505, 4613, 6307, 11203, 23065, 31535, 34927, 56015, 78421, 174635, 244489, 392105, 593759, 1222445, 2968795, 4156313, 20781565]

約数ペア:

[(1, 20781565), (5, 4156313), (7, 2968795), (17, 1222445), (35, 593759), (53, 392105), (85, 244489), (119, 174635), (265, 78421), (371, 56015), (595, 34927), (659, 31535), (901, 23065), (1855, 11203), (3295, 6307), (4505, 4613)]