20781020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{257}}^1\times {\mathrm{311}}^1$

素因数の和:590

約数の個数: 48

約数和(自身を含む): 47331648

約数和(自身を除く): 26550628

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 257, 260, 311, 514, 622, 1028, 1244, 1285, 1555, 2570, 3110, 3341, 4043, 5140, 6220, 6682, 8086, 13364, 16172, 16705, 20215, 33410, 40430, 66820, 79927, 80860, 159854, 319708, 399635, 799270, 1039051, 1598540, 2078102, 4156204, 5195255, 10390510, 20781020]

約数ペア:

[(1, 20781020), (2, 10390510), (4, 5195255), (5, 4156204), (10, 2078102), (13, 1598540), (20, 1039051), (26, 799270), (52, 399635), (65, 319708), (130, 159854), (257, 80860), (260, 79927), (311, 66820), (514, 40430), (622, 33410), (1028, 20215), (1244, 16705), (1285, 16172), (1555, 13364), (2570, 8086), (3110, 6682), (3341, 6220), (4043, 5140)]