21019719

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{379}}^1$

素因数の和:547

約数の個数: 32

約数和(自身を含む): 34048000

約数和(自身を除く): 13028281

約数列:

[1, 3, 7, 19, 21, 57, 133, 139, 379, 399, 417, 973, 1137, 2641, 2653, 2919, 7201, 7923, 7959, 18487, 21603, 50407, 52681, 55461, 151221, 158043, 368767, 1000939, 1106301, 3002817, 7006573, 21019719]

約数ペア:

[(1, 21019719), (3, 7006573), (7, 3002817), (19, 1106301), (21, 1000939), (57, 368767), (133, 158043), (139, 151221), (379, 55461), (399, 52681), (417, 50407), (973, 21603), (1137, 18487), (2641, 7959), (2653, 7923), (2919, 7201)]