21615741

素因数分解:

$3^4\times 7^1\times {\mathrm{67}}^1\times {\mathrm{569}}^1$

素因数の和:655

約数の個数: 40

約数和(自身を含む): 37519680

約数和(自身を除く): 15903939

約数列:

[1, 3, 7, 9, 21, 27, 63, 67, 81, 189, 201, 469, 567, 569, 603, 1407, 1707, 1809, 3983, 4221, 5121, 5427, 11949, 12663, 15363, 35847, 37989, 38123, 46089, 107541, 114369, 266861, 322623, 343107, 800583, 1029321, 2401749, 3087963, 7205247, 21615741]

約数ペア:

[(1, 21615741), (3, 7205247), (7, 3087963), (9, 2401749), (21, 1029321), (27, 800583), (63, 343107), (67, 322623), (81, 266861), (189, 114369), (201, 107541), (469, 46089), (567, 38123), (569, 37989), (603, 35847), (1407, 15363), (1707, 12663), (1809, 11949), (3983, 5427), (4221, 5121)]