21520665

素因数分解:

$3^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{15427}}^1$

素因数の和:15469

約数の個数: 24

約数和(自身を含む): 38508288

約数和(自身を除く): 16987623

約数列:

[1, 3, 5, 9, 15, 31, 45, 93, 155, 279, 465, 1395, 15427, 46281, 77135, 138843, 231405, 478237, 694215, 1434711, 2391185, 4304133, 7173555, 21520665]

約数ペア:

[(1, 21520665), (3, 7173555), (5, 4304133), (9, 2391185), (15, 1434711), (31, 694215), (45, 478237), (93, 231405), (155, 138843), (279, 77135), (465, 46281), (1395, 15427)]