20691688

素因数分解:

$2^3\times {\mathrm{61}}^1\times {\mathrm{109}}^1\times {\mathrm{389}}^1$

素因数の和:565

約数の個数: 32

約数和(自身を含む): 39897000

約数和(自身を除く): 19205312

約数列:

[1, 2, 4, 8, 61, 109, 122, 218, 244, 389, 436, 488, 778, 872, 1556, 3112, 6649, 13298, 23729, 26596, 42401, 47458, 53192, 84802, 94916, 169604, 189832, 339208, 2586461, 5172922, 10345844, 20691688]

約数ペア:

[(1, 20691688), (2, 10345844), (4, 5172922), (8, 2586461), (61, 339208), (109, 189832), (122, 169604), (218, 94916), (244, 84802), (389, 53192), (436, 47458), (488, 42401), (778, 26596), (872, 23729), (1556, 13298), (3112, 6649)]