20640788

素因数分解:

$2^2\times 7^1\times {\mathrm{17}}^1\times {\mathrm{103}}^1\times {\mathrm{421}}^1$

素因数の和:552

約数の個数: 48

約数和(自身を含む): 44239104

約数和(自身を除く): 23598316

約数列:

[1, 2, 4, 7, 14, 17, 28, 34, 68, 103, 119, 206, 238, 412, 421, 476, 721, 842, 1442, 1684, 1751, 2884, 2947, 3502, 5894, 7004, 7157, 11788, 12257, 14314, 24514, 28628, 43363, 49028, 50099, 86726, 100198, 173452, 200396, 303541, 607082, 737171, 1214164, 1474342, 2948684, 5160197, 10320394, 20640788]

約数ペア:

[(1, 20640788), (2, 10320394), (4, 5160197), (7, 2948684), (14, 1474342), (17, 1214164), (28, 737171), (34, 607082), (68, 303541), (103, 200396), (119, 173452), (206, 100198), (238, 86726), (412, 50099), (421, 49028), (476, 43363), (721, 28628), (842, 24514), (1442, 14314), (1684, 12257), (1751, 11788), (2884, 7157), (2947, 7004), (3502, 5894)]