21605980

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{109}}^1$

素因数の和:199

約数の個数: 96

約数和(自身を含む): 53887680

約数和(自身を除く): 32281700

約数列:

[1, 2, 4, 5, 10, 11, 17, 20, 22, 34, 44, 53, 55, 68, 85, 106, 109, 110, 170, 187, 212, 218, 220, 265, 340, 374, 436, 530, 545, 583, 748, 901, 935, 1060, 1090, 1166, 1199, 1802, 1853, 1870, 2180, 2332, 2398, 2915, 3604, 3706, 3740, 4505, 4796, 5777, 5830, 5995, 7412, 9010, 9265, 9911, 11554, 11660, 11990, 18020, 18530, 19822, 20383, 23108, 23980, 28885, 37060, 39644, 40766, 49555, 57770, 63547, 81532, 98209, 99110, 101915, 115540, 127094, 196418, 198220, 203830, 254188, 317735, 392836, 407660, 491045, 635470, 982090, 1080299, 1270940, 1964180, 2160598, 4321196, 5401495, 10802990, 21605980]

約数ペア:

[(1, 21605980), (2, 10802990), (4, 5401495), (5, 4321196), (10, 2160598), (11, 1964180), (17, 1270940), (20, 1080299), (22, 982090), (34, 635470), (44, 491045), (53, 407660), (55, 392836), (68, 317735), (85, 254188), (106, 203830), (109, 198220), (110, 196418), (170, 127094), (187, 115540), (212, 101915), (218, 99110), (220, 98209), (265, 81532), (340, 63547), (374, 57770), (436, 49555), (530, 40766), (545, 39644), (583, 37060), (748, 28885), (901, 23980), (935, 23108), (1060, 20383), (1090, 19822), (1166, 18530), (1199, 18020), (1802, 11990), (1853, 11660), (1870, 11554), (2180, 9911), (2332, 9265), (2398, 9010), (2915, 7412), (3604, 5995), (3706, 5830), (3740, 5777), (4505, 4796)]