20405756

素因数分解:

$2^2\times 7^3\times {\mathrm{107}}^1\times {\mathrm{139}}^1$

素因数の和:271

約数の個数: 48

約数和(自身を含む): 42336000

約数和(自身を除く): 21930244

約数列:

[1, 2, 4, 7, 14, 28, 49, 98, 107, 139, 196, 214, 278, 343, 428, 556, 686, 749, 973, 1372, 1498, 1946, 2996, 3892, 5243, 6811, 10486, 13622, 14873, 20972, 27244, 29746, 36701, 47677, 59492, 73402, 95354, 104111, 146804, 190708, 208222, 416444, 728777, 1457554, 2915108, 5101439, 10202878, 20405756]

約数ペア:

[(1, 20405756), (2, 10202878), (4, 5101439), (7, 2915108), (14, 1457554), (28, 728777), (49, 416444), (98, 208222), (107, 190708), (139, 146804), (196, 104111), (214, 95354), (278, 73402), (343, 59492), (428, 47677), (556, 36701), (686, 29746), (749, 27244), (973, 20972), (1372, 14873), (1498, 13622), (1946, 10486), (2996, 6811), (3892, 5243)]