19987905

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{233}}^1$

素因数の和:310

約数の個数: 64

約数和(自身を含む): 39536640

約数和(自身を除く): 19548735

約数列:

[1, 3, 5, 7, 15, 19, 21, 35, 43, 57, 95, 105, 129, 133, 215, 233, 285, 301, 399, 645, 665, 699, 817, 903, 1165, 1505, 1631, 1995, 2451, 3495, 4085, 4427, 4515, 4893, 5719, 8155, 10019, 12255, 13281, 17157, 22135, 24465, 28595, 30057, 30989, 50095, 66405, 70133, 85785, 92967, 150285, 154945, 190361, 210399, 350665, 464835, 571083, 951805, 1051995, 1332527, 2855415, 3997581, 6662635, 19987905]

約数ペア:

[(1, 19987905), (3, 6662635), (5, 3997581), (7, 2855415), (15, 1332527), (19, 1051995), (21, 951805), (35, 571083), (43, 464835), (57, 350665), (95, 210399), (105, 190361), (129, 154945), (133, 150285), (215, 92967), (233, 85785), (285, 70133), (301, 66405), (399, 50095), (645, 30989), (665, 30057), (699, 28595), (817, 24465), (903, 22135), (1165, 17157), (1505, 13281), (1631, 12255), (1995, 10019), (2451, 8155), (3495, 5719), (4085, 4893), (4427, 4515)]