21109815

素因数分解:

$3^4\times 5^1\times {\mathrm{47}}^1\times {\mathrm{1109}}^1$

素因数の和:1173

約数の個数: 40

約数和(自身を含む): 38681280

約数和(自身を除く): 17571465

約数列:

[1, 3, 5, 9, 15, 27, 45, 47, 81, 135, 141, 235, 405, 423, 705, 1109, 1269, 2115, 3327, 3807, 5545, 6345, 9981, 16635, 19035, 29943, 49905, 52123, 89829, 149715, 156369, 260615, 449145, 469107, 781845, 1407321, 2345535, 4221963, 7036605, 21109815]

約数ペア:

[(1, 21109815), (3, 7036605), (5, 4221963), (9, 2345535), (15, 1407321), (27, 781845), (45, 469107), (47, 449145), (81, 260615), (135, 156369), (141, 149715), (235, 89829), (405, 52123), (423, 49905), (705, 29943), (1109, 19035), (1269, 16635), (2115, 9981), (3327, 6345), (3807, 5545)]