20217904

素因数分解:

$2^4\times 7^1\times {\mathrm{97}}^1\times {\mathrm{1861}}^1$

素因数の和:1973

約数の個数: 40

約数和(自身を含む): 45254048

約数和(自身を除く): 25036144

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 56, 97, 112, 194, 388, 679, 776, 1358, 1552, 1861, 2716, 3722, 5432, 7444, 10864, 13027, 14888, 26054, 29776, 52108, 104216, 180517, 208432, 361034, 722068, 1263619, 1444136, 2527238, 2888272, 5054476, 10108952, 20217904]

約数ペア:

[(1, 20217904), (2, 10108952), (4, 5054476), (7, 2888272), (8, 2527238), (14, 1444136), (16, 1263619), (28, 722068), (56, 361034), (97, 208432), (112, 180517), (194, 104216), (388, 52108), (679, 29776), (776, 26054), (1358, 14888), (1552, 13027), (1861, 10864), (2716, 7444), (3722, 5432)]