20998978

素因数分解:

$2^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{617}}^1$

素因数の和:667

約数の個数: 64

約数和(自身を含む): 44851968

約数和(自身を除く): 23852990

約数列:

[1, 2, 7, 11, 13, 14, 17, 22, 26, 34, 77, 91, 119, 143, 154, 182, 187, 221, 238, 286, 374, 442, 617, 1001, 1234, 1309, 1547, 2002, 2431, 2618, 3094, 4319, 4862, 6787, 8021, 8638, 10489, 13574, 16042, 17017, 20978, 34034, 47509, 56147, 73423, 88231, 95018, 112294, 115379, 136357, 146846, 176462, 230758, 272714, 617617, 807653, 954499, 1235234, 1499927, 1615306, 1908998, 2999854, 10499489, 20998978]

約数ペア:

[(1, 20998978), (2, 10499489), (7, 2999854), (11, 1908998), (13, 1615306), (14, 1499927), (17, 1235234), (22, 954499), (26, 807653), (34, 617617), (77, 272714), (91, 230758), (119, 176462), (143, 146846), (154, 136357), (182, 115379), (187, 112294), (221, 95018), (238, 88231), (286, 73423), (374, 56147), (442, 47509), (617, 34034), (1001, 20978), (1234, 17017), (1309, 16042), (1547, 13574), (2002, 10489), (2431, 8638), (2618, 8021), (3094, 6787), (4319, 4862)]