19992980

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{23}}^1\times {\mathrm{887}}^1$

素因数の和:933

約数の個数: 72

約数和(自身を含む): 51020928

約数和(自身を除く): 31027948

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 23, 28, 35, 46, 49, 70, 92, 98, 115, 140, 161, 196, 230, 245, 322, 460, 490, 644, 805, 887, 980, 1127, 1610, 1774, 2254, 3220, 3548, 4435, 4508, 5635, 6209, 8870, 11270, 12418, 17740, 20401, 22540, 24836, 31045, 40802, 43463, 62090, 81604, 86926, 102005, 124180, 142807, 173852, 204010, 217315, 285614, 408020, 434630, 571228, 714035, 869260, 999649, 1428070, 1999298, 2856140, 3998596, 4998245, 9996490, 19992980]

約数ペア:

[(1, 19992980), (2, 9996490), (4, 4998245), (5, 3998596), (7, 2856140), (10, 1999298), (14, 1428070), (20, 999649), (23, 869260), (28, 714035), (35, 571228), (46, 434630), (49, 408020), (70, 285614), (92, 217315), (98, 204010), (115, 173852), (140, 142807), (161, 124180), (196, 102005), (230, 86926), (245, 81604), (322, 62090), (460, 43463), (490, 40802), (644, 31045), (805, 24836), (887, 22540), (980, 20401), (1127, 17740), (1610, 12418), (1774, 11270), (2254, 8870), (3220, 6209), (3548, 5635), (4435, 4508)]