21047895

素因数分解:

$3^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{421}}^1$

素因数の和:544

約数の個数: 48

約数和(自身を含む): 40289184

約数和(自身を除く): 19241289

約数列:

[1, 3, 5, 9, 11, 15, 33, 45, 55, 99, 101, 165, 303, 421, 495, 505, 909, 1111, 1263, 1515, 2105, 3333, 3789, 4545, 4631, 5555, 6315, 9999, 13893, 16665, 18945, 23155, 41679, 42521, 49995, 69465, 127563, 208395, 212605, 382689, 467731, 637815, 1403193, 1913445, 2338655, 4209579, 7015965, 21047895]

約数ペア:

[(1, 21047895), (3, 7015965), (5, 4209579), (9, 2338655), (11, 1913445), (15, 1403193), (33, 637815), (45, 467731), (55, 382689), (99, 212605), (101, 208395), (165, 127563), (303, 69465), (421, 49995), (495, 42521), (505, 41679), (909, 23155), (1111, 18945), (1263, 16665), (1515, 13893), (2105, 9999), (3333, 6315), (3789, 5555), (4545, 4631)]