20808515

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{83}}^1$

素因数の和:156

約数の個数: 64

約数和(自身を含む): 33868800

約数和(自身を除く): 13060285

約数列:

[1, 5, 7, 13, 19, 29, 35, 65, 83, 91, 95, 133, 145, 203, 247, 377, 415, 455, 551, 581, 665, 1015, 1079, 1235, 1577, 1729, 1885, 2407, 2639, 2755, 2905, 3857, 5395, 7163, 7553, 7885, 8645, 11039, 12035, 13195, 16849, 19285, 20501, 31291, 35815, 37765, 45733, 50141, 55195, 84245, 102505, 143507, 156455, 219037, 228665, 250705, 320131, 594529, 717535, 1095185, 1600655, 2972645, 4161703, 20808515]

約数ペア:

[(1, 20808515), (5, 4161703), (7, 2972645), (13, 1600655), (19, 1095185), (29, 717535), (35, 594529), (65, 320131), (83, 250705), (91, 228665), (95, 219037), (133, 156455), (145, 143507), (203, 102505), (247, 84245), (377, 55195), (415, 50141), (455, 45733), (551, 37765), (581, 35815), (665, 31291), (1015, 20501), (1079, 19285), (1235, 16849), (1577, 13195), (1729, 12035), (1885, 11039), (2407, 8645), (2639, 7885), (2755, 7553), (2905, 7163), (3857, 5395)]