21631785

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{19}}^1\times {\mathrm{1549}}^1$

素因数の和:1590

約数の個数: 48

約数和(自身を含む): 42408000

約数和(自身を除く): 20776215

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 49, 57, 95, 105, 133, 147, 245, 285, 399, 665, 735, 931, 1549, 1995, 2793, 4647, 4655, 7745, 10843, 13965, 23235, 29431, 32529, 54215, 75901, 88293, 147155, 162645, 206017, 227703, 379505, 441465, 618051, 1030085, 1138515, 1442119, 3090255, 4326357, 7210595, 21631785]

約数ペア:

[(1, 21631785), (3, 7210595), (5, 4326357), (7, 3090255), (15, 1442119), (19, 1138515), (21, 1030085), (35, 618051), (49, 441465), (57, 379505), (95, 227703), (105, 206017), (133, 162645), (147, 147155), (245, 88293), (285, 75901), (399, 54215), (665, 32529), (735, 29431), (931, 23235), (1549, 13965), (1995, 10843), (2793, 7745), (4647, 4655)]